1. Etzelclinic, Foot and Ankle Surgery Unit, Pfäffikon, Schwyz, Switzerland
2. Club Atlético Boca Juniors, and Centro de Artroscopia Dr Jorge Batista, Orthopedic and Trauma Surgery, Buenos Aires, Argentina
3. University of Barcelona, Human Anatomy Unit, Department of Pathology and Experimental Therapeutics, Barcelona, Spain
4. Department of Orthopaedic Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
5. Hospital Asepeyo Sant Cugat, Orthopedic and Trauma Surgery, Barcelona, Spain
6. Clinica Tres Torres, Orthopaedic Surgery, Dr. Roux 74, Barcelona, Spain