Cochrane Systematic Review - Intervention Version published: 15 April 2020
https://doi.org/10.1002/14651858.CD011621.pub4
Working Document, September 2017
Cureus 16(2): e53933. DOI 10.7759/cureus.53933
BMC Public Health (2021) 21:299 https://doi.org/10.1186/s12889-021-10296-9
PLOS ONE | https://doi.org/10.1371/journal.pone.0186835 October 30, 2017