1. Jan Kochanowski University in Kielce, Orthopaedic and Traumatology Clinic, Kielce, Poland
2. Center for Specialized Surgery Ortopedika, 03-152 Warsaw, Poland
3. Hip Arthroscopy Mexico, Av. Frida Kahlo 180, Monterrey, Mexico
4. Orthopaedic and Trauma Department, Medical University of Lodz, Lodz, Poland