Efficacy of convenience sampling through the internet versus respondent driven sampling among males who have sex with males in Tallinn and Harju County, Estonia: challenges reaching a hidden population

Author: Johnston Lisa Grazina   Trummal Aire   Lohmus Liilia   Ravalepik Ardi  

Publisher: Routledge Ltd

ISSN: 1360-0451

Source: AIDS Care, Vol.21, Iss.9, 2009-09, pp. : 1195-1202

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