1. Swiss Ortho Center, Swiss Medical Network, Schmerzklinik Basel, Hirschgässlein 15, 4010 Basel, Switzerland
2. Department of Orthopaedic and Trauma Surgery, University Campus Bio-Medico of Rome, Via Alvaro del Portillo 200, 00128 Rome, Italy
3. Foot and Ankle Unit, Orthopaedic Department, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, Spain
4. Foot and Ankle Unit, Orthopedic Surgery and Traumatology Service, Hospital Universitario Virgen del Rocío, Av. Manuel Siurot s/n, 41013 Sevilla, Spain
5. WinOrtho, Technikumstrasse 61, 8400 Winterthur, Switzerland
6. Division of Orthopedic Foot and Ankle Surgery, Department of Orthopedics, Duke University, Durham, NC 27708, USA
7. Hospital Israelita Albert Einstein, Av. Albert Einstein 627, Sao Paulo 05652-900, Brazil