1. Department of Orthopaedic Surgery, Upper Limb Unit, Mansoura University, Mansoura, Egypt
2. Department of Orthopaedic Sports Medicine, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
3. Department of Trauma Surgery, Klinikum Augsburg, Augsburg, Germany
4. Department of Sports Orthopedics, Hessing Klinik, Augsburg, Germany