The effect of low-level laser therapy and physical exercise on pain, stiffness, function, and spatiotemporal gait variables in subjects with bilateral knee osteoarthritis: a blind randomized clinical trial - Braghin, Roberta de Matos Brunelli; Libardi, Elisa Cavalheiro; Junqueira, Carina; Rodrigues, Natalia Camargo; Nogueira-Barbosa, Marcello Henrique; Renno, Ana Claudia Muniz; Abreu, Daniela Cristina Carvalho de (Disability and Rehabilitation, 2019)