1. First Medical Department, Hanusch Hospital; Ludwig-Boltzmann Institute of Osteology; Hanusch Hospital of WGKK, AUVA Trauma Center Meidling; Vienna Austria
2. Paediatric Department; Orthopaedic Hospital of Speising; Vienna Austria
3. Department of Foot and Ankle Surgery; Pediatric Orthopedic Institute; Pushkin Saint-Petersburg Russia
4. Paediatric Orthopaedic Surgery; Children Hospital of Tunis; Tunisia