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Gift Card Incentives and Non-Response Bias in a Survey of Vaccine Providers: The Role of Geographic and Demographic Factors
Van Otterloo J,
Richards JL,
Seib K,
Weiss P,
Omer SB
(2011)
Gift Card Incentives and Non-Response Bias in a Survey of Vaccine Providers: The Role of Geographic and Demographic Factors.
PLOS ONE 6(11): e28108.
https://doi.org/10.1371/journal.pone.0028108