Reliability and validity of a questionnaire for physical activity assessment in South American Children and Adolescents: the SAYCARE Study - Nascimento-Ferreira, Marcus Vinícius; Moraes, Augusto César Ferreira de; Toazza-Oliveira, Paulo Vinícius; Forjaz, C. L. M.; Aristizabal, Juan Carlos; Santaliesra-Pasías, Alba M; Lepera, Candela; Nascimento-Junior, Walter Viana; Skapino, Estela; Delgado, Carlos Alberto; Moreno, Luis Alberto; Carvalho, Heráclito Barbosa (Obesity, 2018)