1. F.C. Barcelona Medical Services, Barcelona, Spain
2. Sports Medicine School, University of Barcelona, Spain
3. Clinica Mapfre de Medicina del Tenis, Barcelona, Spain
4. CAR of Sant Cugat-Consorci Sanitari de Terrassa, Barcelona, Spain
5. Faculty of Pharmacy, University of Barcelona, Spain
6. Servei d’Estadística, Universitat Autònoma de Barcelona, Spain
7. Human Anatomy and Embriology Unit, School of Medicine, University of Barcelona, Spain