This paper is in the following e-collection/theme issue:

Internet-based Survey & Research Methodology 


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Tweetations for "Comparison of US Panel Vendors for Online Surveys" in the last year

Benjamin M Craig, Ron D Hays, A Simon Pickard, David Cella, Dennis A Revicki, Bryce B Reeve
J Med Internet Res 2013 (Nov 29); 15(11):e260 

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