Improving recruitment and retention for an online randomized controlled trial: experience from the Youthnet study

Author: Bull S. S.   Vallejos D.   Levine D.   Ortiz C.  

Publisher: Routledge Ltd

ISSN: 1360-0451

Source: AIDS Care, Vol.20, Iss.8, 2008-09, pp. : 887-893

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