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Attrition bias in a U.S. Internet survey of alcohol use among college freshmen.

McCoy TP, Ip EH, Blocker JN, Champion H, Rhodes SD, Wagoner KG, Mitra A, Wolfson M. Attrition bias in a U.S. Internet survey of alcohol use among college freshmen. J Stud Alcohol Drugs. 2009 Jul; 70(4):606-14.

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