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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