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Nigg, Claudio R.; Motl, Robert W.; Wong, Kristin T.; Yoda, Lisa U.; McCurdy, Dana K.; Paxton, Raheem; Horwath, Caroline C.; Dishman, Rod K. (2009). Impact of mixed survey modes on physical activity and fruit/vegetable consumption: A longitudinal study. Survey Research Methods, 3(2), pp. 81-90. European Survey Research Association 10.18148/srm/2009.v3i2.1092
