Following Up Nonrespondents to an Online Weight Management Intervention: Randomized Trial Comparing Mail versus Telephone by Couper, Mick P, Peytchev, Andy, Strecher, Victor J, Rothert, Kendra, Anderson, Julia

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Reach, Engagement, and Retention in an Internet-Based Weight Loss Program in a Multi-Site Randomized Controlled Trial by Glasgow, Russell E, Nelson, Candace C, Kearney, Kathleen A, Reid, Robert, Ritzwoller, Debra P, Strecher, Victor J, Couper, Mick P, Green, Beverly, Wildenhaus, Kevin

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Engagement and Retention: Measuring Breadth and Depth of Participant Use of an Online Intervention by Couper, Mick P, Alexander, Gwen L, Zhang, Nanhua, Little, Roderick JA, Maddy, Noel, Nowak, Michael A, McClure, Jennifer B, Calvi, Josephine J, Rolnick, Sharon J, Stopponi, Melanie A, Cole Johnson, Christine

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Nonprobability Web Surveys to Measure Sexual Behaviors and Attitudes in the General Population: A Comparison With a Probability Sample Interview Survey by Erens, Bob, Burkill, Sarah, Couper, Mick P, Conrad, Frederick, Clifton, Soazig, Tanton, Clare, Phelps, Andrew, Datta, Jessica, Mercer, Catherine H, Sonnenberg, Pam, Prah, Philip, Mitchell, Kirstin R, Wellings, Kaye, Johnson, Anne M, Copas, Andrew J

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