Hard-to-reach populations of men who have sex with men and sex workers: a systematic review on sampling methods
Crossref DOI link: https://0-doi-org.brum.beds.ac.uk/10.1186/s13643-015-0129-9
Published Online: 2015-10-30
Published Print: 2015-12
Update policy: https://0-doi-org.brum.beds.ac.uk/10.1007/springer_crossmark_policy
Barros, Ana B.
Dias, Sonia F.
Martins, Maria Rosario O.
License valid from 2015-10-30