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. Hip Arthroscopy Australia, 21 Erin Street, Richmond, Victoria 3121, Australia
5. Orthopedic and Trauma Department, Medical University of Lodz, Lodz, Poland
6. Orthopaedic and Traumatology Clinic WUM, Miedzyleski Hospital Warsaw, Warsaw, Poland