1. Department of Foot and Ankle Surgery, Ramsay Healthcare Clinique de l’Union, 31240 Saint Jean, France
2. Department of Orthopedics, Duke University of Medicine, Durham, NC 27710, USA
3. Movement Analysis Laboratory, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
4. Department of Orthopedic Surgery, Federico II University Hospital, 80131 Napoli, Italy