1. Department of Pediatric Orthopedic Surgery and Traumatology, University Children’s Hospital, Medical University of Bialystok, Waszyngtona 17, 15-274 Bialystok, Poland
2. Paley European Institute, Al. Rzeczypospolitej 1, 02-972 Warsaw, Poland
3. Department of Orthopedics and Traumatology, Helsinki University Hospital, 00260 Helsinki, Finland
4. Department of Neurosurgery, Regional Specialized Hospital, Ul. Dekerta 1, 66-400 Gorzow Wielkopolski, Poland
5. 2nd Clinical Department of General and Gastroenterogical Surgery, Medical University of Bialystok, Ul. Marii Skłodowskiej-Curie 24a, 15-276 Bialystok, Poland
6. Department of Pediatric Orthopedics and Oncology of the Musculoskeletal System, Pomeranian Medical University in Szczecin, 71-252 Szczecin, Poland
7. Department of Orthopedics and Rehabilitation, Warsaw Medical University, 02-091 Warsaw, Poland
8. Department of Neurosurgery, University of North Carolina, Chapel Hill, NC 27516, USA
9. Department of Orthopedic Surgery, Washington University School of Medicine, 660 S Euclid Ave., St. Louis, MO 63110, USA
10. Department of Orthopaedic Surgery, Nemours Children’s Health, Delaware Valley,1600 Rockland Road, Wilmington, DE 19803, USA