Using a gamified monitoring app to change adolescents' snack intake: the development of the REWARD app and evaluation design. - Van Lippevelde, W.; Vangeel, J.; De Cock, N.; Lachat, C.; Goossens, L.; Beullens, K.; Vervoort, L.; Braet, C.; Maes, L.; Eggermont, S.; Deforche, B.; Van Camp, J. (BMC Public Health, 2016)