Last revised 2015.
Original Word document on: http://www.epnetwork.org/Resources/Standard%20Operating%20Procedure/Valuable%20tips%20in%20deciding%20what%20to%20order_SOP.doc
Petersenet al.International Journal of Mental Health Systems2011,5:8http://www.ijmhs.com/content/5/1/8
Clinical Infectious Diseases 2010; 50:291–322
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http://www.who.int/disabilities/cbr/guidelines/en/