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

Web-based and Mobile Health Interventions  Research Participants Recruitment and Engagement 

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Works citing "Impact of Seasonality on Recruitment, Retention, Adherence, and Outcomes in a Web-Based Smoking Cessation Intervention: Randomized Controlled Trial"

Amanda L Graham, Sarah Cha, Nathan K Cobb, Ye Fang, Raymond S Niaura, Aaron Mushro
J Med Internet Res 2013 (Nov 07); 15(11):e249 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2880):

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

1. Köpcke F, Prokosch H. Employing Computers for the Recruitment into Clinical Trials: A Comprehensive Systematic Review. Journal of Medical Internet Research 2014;16(7):e161 [CrossRef]