Search database
LIST OPTIONS
Filter
251
Filtered Results: 251
Text search: M. S. Razai
Featured
Language
Document type
No document type
119
Studies & Reports
66
Guidelines
44
Manuals
9
Training Material
5
Fact sheets
3
Strategic & Response Plan
2
Situation Updates
1
Resource Platforms
1
Infographics
1
Countries / Regions
Uganda
10
Global
9
Latin America and the Carribbean
8
Kenya
6
Tanzania
6
India
6
Africa
5
Argentina
5
Indonesia
5
Madagascar
5
Nepal
4
Colombia
4
El Salvador
4
Cameroon
4
Peru
4
Venezuela
4
Bolivia
4
Ethiopia
4
Lesotho
3
Rwanda
3
Chile
3
Nigeria
3
Malawi
3
Zimbabwe
3
Guinea
3
Congo, Democratic Republic of
3
West and Central Africa
3
Paraguay
3
East and Southern Africa
3
Zambia
3
Ukraine
2
Benin
2
Sierra Leone
2
Jordan
2
Germany
2
Western and Central Europe
2
United Kingdom
2
Spain
2
Côte d’Ivoire / Ivory Coast
2
South Africa
2
Brazil
2
Russia
2
Namibia
2
Liberia
2
Ecuador
2
Eswatini/ Swaziland
2
Guatemala
2
Tajikistan
1
Mexico
1
Ghana
1
Syria
1
Burkina Faso
1
Mozambique
1
Haiti
1
Asia
1
Dominican Republic
1
Middle East and North Africa
1
South–East Asia Region
1
Eastern Europe and Central Asia
1
Portugal
1
Israel
1
Lebanon
1
Eastern Europe
1
Nicaragua
1
Honduras
1
Angola
1
Chad
1
Botswana
1
Cuba
1
Authors & Publishers
et al.
20
World Health Organization WHO
19
World Health Organization (WHO)
10
UNAIDS
9
World Health Organization
9
IACAPAP
7
Ministry of Health of Republic of Indonesia
4
Pusat Krisis Kesehatan
4
USAID
4
World Health Organisation (WHO)
4
Organización Panamericana de la Salud
3
Oxfam
3
A. Mejia
2
BMJ
2
Conant, J.
2
D. Haslam
2
Fadem, P.
2
Federal Ministry of Health, Nigeria
2
Hesperian
2
ICF International
2
Indian Council of Medical Research (ICMR)
2
Journal of the International AIDS Society
2
M. R. Sanders
2
Ministerio de Salud - Peru
2
Ministerio de Salud Argentina
2
Ministerio de Salud Chile
2
Ministry of Health and Social Welfare, Tanzania
2
National Agency for the Control of AIDS (NACA)
2
ONUSIDA
2
Organisation Mondiale de la Santé OMS
2
Organización Mundial de la Salud OMS
2
P. J. de Vries
2
Pan American Health Organization PAHO
2
Rockville, Maryland, USA: ICF International
2
Samwel Mbugua, Kerry L. D. MacQuarrie
2
Unicef
2
United Nations Children's Fund (UNICEF)
2
2011
1
A. Bello Cherifath
1
A. G. Lentoor
1
A. Latypov
1
A. Long
1
A. Muñoz del Carpio Toia
1
A. Rakotoarisoa, L. Randrianasolo, S. Tempia, et al.
1
A. T. Choko
1
A. Turkova
1
A. Vieno
1
Abubakar, B.K.
1
ACCSI, CIAT
1
ACT Watch Group  et al
1
Action Against Hunger
1
Action contre la Faim France
1
Adler, A.J.
1
Africa CDC Centres for Disease Control and Prevention
1
African Union
1
Agencia Espanola de Cooperación International para el Desarrollo
1
Agencia Espanola de Cooperatión International para el Desarrollo
1
Agudelo Calderón,C.
1
Ahmad, U., Chau, D.M. et al.
1
AIDS Research and Therapy
1
Alabí Montoya, F.J.
1
Alzheimer's Association
1
and J. Roberto
1
and T. Clasen
1
Antares Foundation
1
Aparecida Vincent, V. et al.
1
Aranka Anema1,2*, C. G. Au-Yeung
1
Arbeitskreises Blut des Bundesministeriums für Gesundheit
1
Arii M., F. Baele, J. Bedford et al.
1
Ashish KC, R. Gurung, M.V Kinney, et al.
1
Ashish, K.C.
1
Ateudjieu, J.
1
Balamurali, M.
1
Bapoutou, B.
1
Baraldi, E.
1
Barba, E.
1
Bastable, Andy and Russell, Lucy
1
Beverly D Glass
1
BioMed Central
1
BioMed Research International
1
BMC
1
BMC Infectious Diseases
1
BMC Medicine
1
BMC Public Health
1
BMJ Global Health
1
BMJ Journals
1
BPtK Bundespsychotherapeuten Kammer
1
Brakarsh, J.
1
Brand, P.L. et al.
1
Brindha, J.
1
British HIV Association
1
Brown, J.
1
Buendía, J.
1
Bull World Health Organ
1
Bulletin of the World Health Organization
1
Burns, A. and S. Iliffe
1
C. and B. Kwagala
1
C. C. Johnson
1
C. Giannou and M. Baldan
1
C. Hasenkopf and K. Lee
1
Carla Silva-Matos
1
Catholic Relief Services CRS
1
CDC United States
1
Cecchi, G.
1
Cecil Konijnendijk, Dikshya Devkota, Stephanie Mansourian & Christoph Wildburger (eds.)
1
Central Asia-Caucasus Institute
1
Centre de Formation et de Recherche en matière de Population (CEFORP), Cotonou-Bénin
1
Centre Pasteur du Cameroun
1
Chikutsa, Antony, Alfred C. Ncube, and Shepard Mutsau
1
Circulation
1
Cobrales, M.
1
Comité International de la Cruz Rojay CICR
1
D.Currie
1
D.enis Akakimpa
1
David Beran
1
Davies, T.
1
Denis Mubiru, Robert Byabasheija, John Baptist Bwanika, et al.
1
Department of Health & Human Services USA
1
DGVS
1
DHS Further Analysis Reports No. 111
1
Diabetes Internacional
1
Diarra, A. et al.
1
Dr. S. Eyangoh et. al.
1
Dr. Vernet G
1
E. Chiappini
1
E. Venturini
1
E.J. Rakotonirina, L.A. Raharitiana, L. Ravaoariso, et al.
1
Edgar Carrasco, Enrique González
1
EMERGE
1
Esterhuizen, J.
1
et al
1
European Centre for Disease Prevention and Control
1
European Respiratory Journal
1
Extending Service Delivery (ESD) Project, USAID
1
F. Bajunirwe
1
F. Bozzani et al.
1
F. Kiweewa, A.Dasgupta
1
F. Tumwebaze
1
Federal Democratic Republic of Ethiopia, Ministry of Health
1
Federal Ministry of Health, Uganda
1
Feed the Future
1
FIGO
1
Fishel, Joy D., Ruilin Ren, Bernard Barrère, and Trevor N. Croft
1
Franco J, Simarro P, Diarra A, Jannin J
1
Franco, JR.
1
Frontiers in Chemistry
1
G. B Kulkarni
1
G. Gururaj
1
G. N. Rao
1
Gajda M., E. Urban
1
GBD 2019 Blindness and Vision Impairment Collaborators
1
GBD2019 Dementia Forecasting Coolaborators
1
GEF, UNIDO, MoEFCC
1
Gilma Mantilla
1
Global Mental Health
1
GMDAC, University of Potsdam
1
Government of Nepal Ministry of Education Department of Education
1
Grech, S
1
Greenstone, M.
1
Groupe de travail interorganisations sur la santé reproductive en situations de crise
1
Guimaraes, Alice Soares
1
H. E. Hutton et al.
1
Haarmann, E.
1
Hasker E, Hope A, Bottieau E.
1
HBSC
1
Health Policy Project
1
Hindawi
1
Holy Father Paul VI
1
House, S.
1
Huffman, M. et al.
1
I. Hall
1
I. Mbabali
1
ICF
1
Informe de la Nutrición Mundial
1
INTECH
1
International Campaign to Ban Landmines – Cluster Munition Coalition (ICBL-CMC)
1
International Bank for Reconstruction and Development / The World Bank
1
International Diabetes Federation
1
International Pharmaceutical Federation (FIP)
1
International Research Institute for Climate and Society
1
International Union Against Tuberculosis and Lung Disease, World Health Organization
1
International Union of Forest Research Organizations (IUFRO)
1
J. A. Caminero, A. Van Deun, P. I. Fujiwara, et. al
1
J. de Jesus Mari, D. Razzouk, R. Thara, et al.
1
J. Inchley
1
J. J. Fiol
1
J. Tjaden
1
J. Turan
1
J.Kelly, M.VanRooyen, J.Kabanga, et al. (Harvard Humanitarian Initiative)
1
Jan H. Kolaczinski, et al.
1
Jésuites d'Afrique de l'Ouest
1
Jimann, N.S.
1
Journal of Family Medicine and Disease Prevention
1
journal of Global health
1
Journal of the International Association of Providers of AIDS Care
1
K. Church
1
K. Doerholt
1
Kamali M, Munyuzangabo M, Siddiqui FJ, et al.
1
Karen Weidert, Amanuel Gessessew, Suzanne Bellet al.
1
Kaushik, C.
1
Kirakoya-Samadoulougou F., K. Jean, M. Maheu-Giroux
1
Kivelä, L. & Tajima-Simpson, M.
1
Kovacic, V.
1
L. Nyblade
1
L. Pacione
1
L. Steinitz
1
L. Telisinghe, K. L. Fielding, J. L. Malden, et al.
1
La Revue Médicale de Madagascar
1
Lamunu M, Lutwama J.J, Kamugisha J
1
Laurence Cibrelus
1
Libreria Editrice Vaticana
1
London School of Hygiene and Tropical Medicine.
1
Lund, C.
1
M. A. Jiménez
1
M. Joffres
1
M. K. Kumwenda
1
M. Ndinakie Yakum, A. Pascal Goura
1
M. S. Razai
1
Maclean Soruco, Enrique y Eguivar, Mario A
1
Makatjane, T. J., T. Hlabana, and E. M. Letete
1
Malaria Consortium
1
Mangwiro, TNC.
1
Maryland, USA: ICF International
1
Mbugua S., L. D. MacQuarrie K.
1
McKee, M.
1
Ministere de la Sante, Rwanda Biomedical Centre
1
Ministerio de la Protección Social, Colombia
1
Ministerio de Salud
1
Ministerio de Salud Bolivia
1
Ministerio de Salud El Salvador
1
Ministerio de Salud et Desarrollo Social, Presidencia de la Nación, Argentina
1
Ministerio de Salud Lineamientos para el diagnóstico, abordaje en el período agudo y seguimiento post COVID-19 de niños, niñas y adolescentes Programa Nacional de Salud Escolar (PROSANE) y Sociedad Argentina de Pediatría (SAP)
1
Ministerio de Salud Pública y Bienestar Social
1
Ministerio de salud pública y bienestar social, Paraguay todos y todas, et al.
1
Ministerio de Salud y Protección Social, Colombia
1
Ministerio de Salud, Bolivia
1
Ministerio de Salud, Ecuador
1
Ministerio de Salud, El Salvador
1
Ministère de la Santé de Madagascar in collaboration with WHO
1
Ministra de Salud y Desarrollo Social, Argentina
1
Ministry of Health and Social Welfare, National AIDS Control Programme, Tanzania
1
Ministry of Health Republic of Indonesia
1
Ministry of Health, Kenya
1
Ministry of Health, Nepal
1
Ministry of Health, Uganda
1
Mmbaga, Elia John
1
Mme C. Owona
1
Moukaïla Amadou
1
MSMGF
1
Muzammil and Lopes
1
Myron L Belfer, Suzan Song
1
Naik, W. & Kaneda, T.
1
Nankinga, O.
1
National Library of Medicine
1
OCHA
1
OEA (Más derechos para más gente)
1
Oficina Regional de la Organización Mundial de la Salud
1
Oranizatión Panamerica de la Salud
1
Organisation mondial de la Santé
1
Organisation Mondiale de la Santé OMS
1
Organización Mundial de la Salud (Americas)
1
Organización Mundial de la Salud (Américas)
1
Organización Panamericana de la Salud OPS
1
Organização Mundial da Saúde (OMS)
1
P. Gomes de Alvarenga
1
P. Monfiston
1
Pan American Health Organisation PAHO
1
Pan American Health Organization
1
Pan American Health Organization (PAHO)
1
Panos Institute Southern Africa
1
Paone, M.
1
Pardo, R.
1
Paul, A., Adeloye, D., George-Carey, et al.
1
Pedrozo e Silva de Azevedo, C.
1
PEPFAR
1
Pijnenburg, M.W.
1
Plos Medicine
1
PLOS Neglected Tropical Diseases
1
PLOS One
1
PMC (US National Library of Medicine National Institutes of Health)
1
Population Reference Bureau
1
Priotto, G.
1
PRONASIDA
1
PubMed.gov
1
Quality Rights
1
R. Granich
1
R. Kronick
1
R. R. Althoff
1
R. S. Mastrorosa, M. Conceição do Rosário
1
Rajesh Upadhyay, Milind Y Nadkar, A Muruganathan
1
Reliefweb
1
Research Gate
1
Revista Latinoamericana de Desarrollo Económico
1
Robert-Koch-Institut RKI
1
Rosas, F.
1
Rugigana, Etienne, Francine Birungi, and Manassé Nzayirambaho
1
Rutstein, S.E., J. Ananworanich, S. Fidler, et al.
1
S. Cabrera
1
S. Gupta
1
S. Ladhani
1
S. Scott
1
S. Sweeney
1
salud
1
Santo Padre Francisco
1
Santos, D.
1
Saudi Journal of Biological Sciences
1
Save the Children
1
Sánchez-Pérez, H. J.
1
Schwalm, J.
1
Schwartz, L.
1
Secretaría General de la Organización de los Estados Americanos
1
Shears, Paul, T.J.D. O'Dempsey
1
Silk Road Studies Program
1
Sociedad Colombiana de Cardiología y cirugía cardiovascular
1
STRIVE
1
T. Mahon and S. Cavill
1
T. Measham
1
T.Samudio, P.Ovelar, et al.
1
Tan, H.-L. and K. Hawkins
1
Tanzania Diabetes Association
1
Tanzania Ministry of Health, Community Development, Gender, Elderly and Children.
1
The Alliance for children protection in humanitarian action
1
The International Federation of Red Cross and Red Crescent Societies IFRC
1
The Journal of Headache and Pain
1
The Lancet
1
The Lancet Global Health
1
Tirados, I.
1
Torres-Rueda S.
1
Trujillo, C.
1
UN Children's Fund UNICEF
1
UN High Commissioner for Refugees UNHCR
1
UNAIDS (Joint United Nations Programme on HIV
1
UNAIDS (Joint United Nations Programme on HIV/AIDS)
1
UNDP
1
UNEP
1
UNESCO
1
UNFPA, Defensoría del pueblo
1
UNFPA, Save the Children USA
1
UNICEF, World Food Programme (WFP)
1
Unión Internacional Contra la Tuberculosis y Enfermedades Respiratorias
1
United Nations Children's Fund (UNICEF) & Protecting Through Education (RET)
1
University of Chicago’s Energy Policy Institute
1
Uppsala Universitet
1
Valdez Cazeneuve, R.
1
Vale, GA et al.
1
Vanegas, D.
1
Vatican Press
1
Vergès de López, C.
1
Verjeen, M.
1
Water Aid
1
Web of Science
1
WHO
1
Wolters Kluwer Health, Inc.
1
World Health Organization (Americas)
1
World Health Organization (Europe)
1
World Health Organization (WHO), Regional Office for South-East Asia
1
World Health Organization WHO, Regional Office for Europe
1
World Health Organization WHO, Regional Office for Eastern Mediterranean Region
1
World Health Organization, Regional Office for the Americas
1
Zinsou, C.
1
Zulianlly Rojas, Saylee Ochoa, Román Millán, et al.
1
Всемирная организация здравоохранения
1
Департамент здравоохранения города Москвы
1
Е.Л. Никонов, С.В. Кашин,Р.О. Куваев, et al.
1
Publication Years
Category
Guidelines
22
Studies & Reports
22
Policies & Guidelines HIV & TB
15
COVID-19
11
Policies
8
Women & Child Health
8
Demograhic Health Surveys DHS
7
Humanitarian Crisis
5
WASH
5
Reproductive Health
5
Communicable Diseases
4
Non-communicable Diseases
4
Yersinia pestis (Plague)
3
Drugs & Medical Equipment
3
Community Health
3
Capacity Building
3
Humanitarian Aid
2
Community Health
2
Sexual Violence
2
Vaccine-preventable Diseases
2
Chagas
2
Training Manuals
2
Mental Health
2
Other
2
Waste Management
2
Age & Elderly
2
Hygiene Promotion
2
Food Security & Nutrition
2
Family Planning
1
Sanitation
1
Child Health
1
Diabetes
1
Bacteriology
1
Schistosomiasis
1
Lymphaticfilariasis
1
Vector Control
1
TB
1
Water, Sanitation and Hygiene (WASH)
1
Menstrual Hygiene Management
1
Public Health
1
Countries
1
Health System Strengthening
1
Cardiovascular Diseases
1
Violence against Children
1
Child protection
1
Information, Education and Communication (IEC)
1
Quality Control & Assurance
1
Surgery & Anaesthesia
1
Gynaecology & Obstetrics
1
Protection & Security
1
NTDs & Others
1
Fecal Disposal / Latrines
1
Maternal Health
1
Human African Trypanosomiasis
1
HIV & STI
1
Water
1
Toolboxes
Country specific documents
8
IACAPAP International Association for Child and Adolescent Psychiatry and Allied Professions
7
Children/Adolescents Mental Disorders
7
Children & Adolescents
5
Male Circumcision
4
General Reports
4
Global
4
PPE Personel Protective Equipment
4
Reports & Studies
4
Background PTSD in children
3
General Studies & Reports
3
Manuals
3
Clinical Guidelines
3
Universal Health Coverage UHC and 90-90-90 Strategy
3
For Health Worker
3
Hospital Readiness/Essential Health Services
3
Access & Strategy
3
Other Countries
3
Studies & Reports
3
Women
3
Postexposure Prophylaxis (PEP), Pre-Exposure Prophylaxis (PrEP)
3
Neurological Disorders
3
Alzheimer's Disease & Dementia
3
Latin America & the Carribean
3
Plague Prevention & Control
3
Alcohol
2
Psychosocial Support (MHPSS)
2
Assessment & Studies
2
Training Manuals
2
Policies
2
Treatment Guidelines HIV
2
Studies & Reports
2
Stress
2
Paediatrics
2
Encyclical Letters
2
Immunization Guidelines
2
Waste Management
2
El Salvador
2
Overview & reports
2
Pharmacy Practice
2
Supply Chain & Store Management
2
Argentina
2
Waste Managment
2
Studies & Reports
2
Detection & Diagnosis
2
Substance Use Disorders & Addiction
2
TB/HIV Coinfection
2
WASH
2
AmR (Region of Americas)
2
MHPSS Guidelines
2
Reports & Studies Children HIV
2
Eastern Europe and central Asia
2
Africa
1
War & Conflict
1
Outbreak Prevention & Control
1
ART Drug Resistance
1
HIV in Children and mental health
1
HIV testing & services
1
Plague Situation Reports
1
Clinical Aspects, Treatment & Prevention
1
Europe
1
Inclusion
1
Prevention & Control
1
Explosives
1
Plague
1
Prevention Guidelines
1
Schizophrenia
1
Children
1
Eastern Mediterranean Region
1
Transgender People
1
Social Worker
1
Legislative Texts
1
Orphans & vulnerable children
1
Eastern Europe
1
Africa
1
Physiotherapy & Rehabilitation
1
Children
1
Health & Refugee
1
Discrimination & Stigma
1
Human Rights
1
Health Equity & Equality
1
Mental Health Studies & Reports
1
Women's Mental Health
1
Epilepsy
1
Posttraumatic Stress Disorder in Children
1
Reports
1
Climate & Health
1
Context & Facts
1
Studies
1
Context & Facts, Travel Advice
1
COVID-19
1
Surveillance & Contact tracing
1
Faith-based Organizations
1
For People with Disabilities
1
Global Impact: Socio-economic, health services, TB & HIV
1
Prison & Detention
1
Human Rights
1
Protection of Vulnerable Groups
1
Child Protection
1
Gender Aspects
1
Social Ethics
1
HIV and COVID-19
1
Medical & Community Masks
1
Children & Mental Health
1
Coping with Stress
1
Community Health
1
COVID-19 Vaccination
1
Non-pharmaceutical interventions (NPIs)
1
Psychosocial Support
1
Fair Allocation & Ethical Aspects
1
SARS-CoV-2 Variants
1
Vector-based Vacines General
1
Stress
1
Primary Care
1
Health Promotion
1
Latin America
1
Overview
1
Peru
1
Planetary Health
1
Climate Change General
1
Reports
1
Clean air
1
Mobility
1
Falsified & Substandard
1
Traditional & Herbal Medicines
1
HIV &TB
1
Freshwater use
1
Agriculture incl. animal husbandry
1
Epilepsy
1
General Guidelines for Rational Use
1
Reports & Studies
1
Environment
1
Health Care Systems
1
Public Health
1
Mental Health
1
Non-communicable Diseases NCD
1
Education Principles
1
Others
1
WASH Water Sanitation & Hygiene
1
Clinical Aspects & Diagnostics
1
Clinical Aspects & Diagnostics
1
Information & Education Material (IEC)
1
Statistics & Facts
1
Statistics & Facts
1
Studies & Reports
1
Studies & Reports
1
Studies & Reports
1
Policies & Strategies
1
Mycetoma, Chromoblastomycosis & other deep mycosis
1
Education
1
Awareness
1
General Information
1
Prevention & Strategies
1
Studies & Reports
1
Studies & Reports
1
Studies & Reports
1
Studies & Reports
1
General
1
Drug resistant TB
1
others
1
General
1
Community Worker
1
General Aspects
1
Protection
1
Assessment & Response
1
TB & Prisoners
1
Disease Prevention & Control
1
Regions
1
Mental Health
1
Training
1
Vision Loss & Blindness
1
International
1
HIV and coinfection
1
Psychosocial Support
1
Community Based Rehabilitation (CBR)
1
Planetary Health
1
War, Conflict Areas & Refugees
1
Refugees & Migrants
1
HIV in Key Populations
1
Preparedness & Prevention
1
IEC Material Neurological Disorders
1
Depression
1
Case Definitions
1
Volunteers
1
Neurological disorders, Others
1
Training & Capacity Building
1
Joint United Nations Programme on HIV/AIDS (UNAIDS).
Prepared as an outcome of ICMR Subcommittee on Buccal Mucosa Cancer | This consensus document on management of Buccal Mucosa cancers summarizes the modalities of treatment including the site-specific anti-cancer therapies, supportive and palliative care and molecular markers and research questions. ... more
The emergency Water, Sanitation and Hygiene Promotion (WASH) gap analysis project was funded by The Humanitarian Innovation Fund (HIF), a program managed by Enhancing Learning and Research for Humanitarian Assistance (ELRHA) in partnership with the Active Learning Network for Accountability and Per... more
Protocolo 6
'Ethical Issues in Obstetrics and Gynecology' represents the results of carefully researched and considered discussion. The guidelines are intended to provide material for consideration and debate about ethical aspects of our discipline for member organisations and their constituent membership.
Working Paper No. 4
www.jogh.org • doi: 10.7189/jogh.02.020405 ~ December 2012 • Vol. 2 No. 2 • 020405
Guía de buenas prácticas.Tercera edición Las directrices se organizan en torno a ocho principios clave que corresponden al curso del contrato de un funcionario. El diagrama adjunto representa los principios de forma visual. Cada principio cuenta con indicadores y comentarios de apoyo, así como ... more
PlosOne May 7, 2012 https://doi.org/10.1371/journal.pone.0036735 ; Safe drinking water is critical for health. Household water treatment (HWT) has been recommended for improving access to potable water where existing sources are unsafe. Reports of low adherence to HWT may limit the usefulness of thi... more

Santé de la Reproduction et statut de la femme au Bénin : Etat des lieux et perspectives

Moukaïla Amadou Centre de Formation et de Recherche en matière de Population (CEFORP), Cotonou-Bénin (2011) C2
La situation de la santé de reproduction continue de faire l’objet de grandes préoccupations à l’échelle mondiale surtout dans les pays en développement. En Afrique, par exemple, 45% des femmes pratiquant un avortement décèdent. De même, la fécondité en Afrique subsaharienne demeure... more

Climate Information For Public Health: A Curriculum For Best Practices

Laurence Cibrelus; Gilma Mantilla International Research Institute for Climate and Society (2011) C1
CIPH Curriculum for Best Practices. Putting Principles to Work