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