Reach, engagement, and retention in an Internet-based weight loss program in a multi-site randomized controlled trial.
Glasgow RE, Nelson CC, Kearney KA, Reid R, Ritzwoller DP, Strecher VJ, Couper MP, Green B, Wildenhaus K. Reach, engagement, and retention in an Internet-based weight loss program in a multi-site randomized controlled trial. J Med Internet Res. 2007 May 09; 9(2):e11.