1. Department of Foot and Ankle Surgery, Clinique de l’Union, Ramsay Healthcare, Saint Jean, France
2. Trauma and Orthopaedics Unit, Department of Public Health, University of Naples Federico II, Naples, Italy
3. ZNA Middelheim, Antwerp, Belgium
4. Royal National Orthopaedic Hospital, London, United Kingdom
5. The Hospital for Special Surgery, Weill Cornell Medical College, New York, NY
6. Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa