[1] Hosp Santa Creu & Sant Pau, Ctr Cochrane Iberoamer, Barcelona 08041, Spain
[2] Univ Huddersfield, Ctr Hlth & Social Care Res, Huddersfield HD1 3DH, W Yorkshire, England
[3] Univ Ferrara, Clin Ortoped & Traumatol, Dipartimento Sci Biomed & Terapie Avanzate, I-44100 Ferrara, Italy