Efficacy of prolonged application of low-level laser therapy combined with exercise in knee osteoarthritis: a randomized controlled double-blind study - Alfredo, Patricia Pereira; Bjordal, Jan Magnus; Lopes-Martins, Rodrigo Alvaro Brandao; Johnson, Mark I; Junior, Washington Steagall; Marques, Amelia Pasqual; Casarotto, Raquel Aparecida (Clinical rehabilitation, 2022)