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Bull World Health Organ 2017;95:594–598
Operational Guidelines
BMC Health Services Research (2017) 17:623 DOI 10.1186/s12913-017-2567-7
BMC Health Services Research 2012, 12:352 http://www.biomedcentral.com/1472-6963/12/352
PLoS ONE 11(1): e0144662. doi:10.1371/journal.pone.0144662