1. Ludwig Boltzmann Institute of Osteology; Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling; Vienna Austria
2. First Medical Department; Hanusch Hospital; Vienna Austria
3. Paediatric Department; Orthopaedic Hospital of Speising; Vienna Austria
4. Department of Foot and Ankle Surgery; Neuro-orthopaedics and Systemic Disorders; Pediatric Orthopaedic Institute n.a. H. Turner; Saint-Petersburg Russia
5. Paediatric Orthopaedic Surgery; Children Hospital; Tunis Tunisia