This paper is in the following e-collections/theme issues:

Mobile Health (mhealth)  Research Participants Recruitment and Engagement  Text-messaging (SMS)-Based Interventions 

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Works citing "Enhancing Retention of an Internet-Based Cohort Study of Men Who Have Sex With Men (MSM) via Text Messaging: Randomized Controlled Trial "

Christine M Khosropour, Brent A Johnson, Alexandra V Ricca, Patrick S Sullivan
J Med Internet Res 2013 (Aug 27); 15(8):e194 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2756):

(note that this is only a small subset of citations)

1. Huang D, Hu Y, Wu G, Jia Y, Lu R, Xiao Y, Raymond HF, McFarland W, Ruan Y, Ma W, Sun J. HIV Prevention Services and Testing Utilization Behaviors among Men Who Have Sex with Men at Elevated Risk for HIV in Chongqing, China. BioMed Research International 2014;2014:1 [CrossRef]
2. Hernandez-Romieu AC, Sullivan PS, Sanchez TH, Kelley CF, Peterson JL, del Rio C, Salazar LF, Frew PM, Rosenberg ES. The Comparability of Men Who Have Sex With Men Recruited From Venue-Time-Space Sampling and Facebook: A Cohort Study. JMIR Research Protocols 2014;3(3):e37 [CrossRef]