Objectively-measured physical activity in children is influenced by social indicators rather than biological lifecourse factors: Evidence from a Brazilian cohort - Knuth, Alan G.; Silva, Inácio Crochemore M.; Hees, Vincent T. van; Cordeira, Kelly; Matijasevich, Alícia; Barros, Aluísio J. D.; Santos, Iná; Ekelund, Ulf; Hallal, Pedro Curi (Preventive Medicine, 2017)