1. Department of Orthopedic Surgery, Ciechanów Hospital, 06-400 Ciechanów, Poland
2. Faculty of Medicine, Medical University of Warsaw, 01-938 Warsaw, Poland
3. Central Clinical Hospital of the Ministry of Interior and Administration in Warsaw, 02-507 Warsaw, Poland
4. Medical Rehabilitation Center, Sobieskiego 47D, 05-120 Legionowo, Poland