1. Department of Pediatric Orthopaedics and Foot and Ankle Surgery, Orthopaedic Hospital Speising, Vienna, Austria
2. Shriners Hospitals for Children, Philadelphia and Greenville; The Hospital for Special Surgery, New York, USA
3. Sorbonne University, AP-HP, Hôpital Trousseau, Service de Chirurgie Orthopédique et réparatrice de l'enfant, Paris, France
4. Amsterdam UMC, Department of Plastic, Reconstructive, and Hand Surgery, Amsterdam, The Netherlands
5. Handsurgery Department, Children’s Hospital Wilhelmstift, Hamburg, Germany
6. Division of Orthopaedic Surgery, Oslo University Hospital, Oslo, Norway