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Bringolf-Isler, Bettina; Mäder, Urs; Ruch, Nicole; Kriemler, Susi; Grize, Leticia; Braun-Fahrländer, Charlotte (2012). Measuring and Validating Physical Activity and Ssedentary Behavior Comparing a Parental Questionnaire to Accelerometer Data and Diaries Pediatric Exercise Science, 24(2), pp. 229-245. Human Kinetics 10.1123/pes.24.2.229