Efficacy of graded activity versus supervised exercises in patients with chronic non-specific low back pain: protocol of a randomised controlled trial - Magalhaes, Mauricio Oliveira; França, Fábio Jorge Renovato; Burke, Thomaz Nogueira; Ramos, Luiz Armando Vidal; Carvalho e Silva, Ana Paula de Moura Campos; Almeida, Gabriel Peixoto Leao; Yuan, Susan Lee King; Marques, Amélia Pasqual (BMC Musculoskeletal Disorders (Online), 2013)