1. Department of Orthopedics and Rheumoorthopedics Centre of Postgraduate Medical Education Otwock Poland
2. Department of Orthopedics Centre of Postgraduate Medical Education Otwock Poland
3. Central Laboratory of Professor Adam Gruca's Hospital Otwock Poland
4. Department of Anatomical Dissection and Donation Medical University of Lodz Lodz Poland
5. Department of Spine Disorders and Orthopedics Centre of Postgraduate Medical Education Otwock Poland