Bull, Sheana S; Levine, Deborah K; Black, Sandra R et al. (2012) Social media-delivered sexual health intervention: a cluster randomized controlled trial. Am J Prev Med 43:467-74
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Bull, Sheana; Pratte, Katherine; Whitesell, Nancy et al. (2009) Effects of an Internet-based intervention for HIV prevention: the Youthnet trials. AIDS Behav 13:474-87
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Bull, S S; Vallejos, D; Levine, D et al. (2008) Improving recruitment and retention for an online randomized controlled trial: experience from the Youthnet study. AIDS Care 20:887-93
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Bull, Sheana Salyers; Phibbs, Stephanie; Watson, Sally et al. (2007) What do young adults expect when they go online? Lessons for development of an STD/HIV and pregnancy prevention website. J Med Syst 31:149-58
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