Effects of a foot-ankle strengthening programme on clinical aspects and gait biomechanics in people with knee osteoarthritis: protocol for a randomised controlled trial - Dantas, Glauko; Sacco, Isabel de Camargo Neves; Santos, Ana F. dos; Watari, Ricky; Matias, Alessandra B; Serrao, Paula R. M. S; Pott-Junior, Henrique; Salvini, Tania F (Bmj open, 2020)