1. Department of Internal Medicine, Asklepios Clinic Uckermark, Am Klinikum 1, 16303, Schwedt/Oder, Germany
2. Department of Orthopedics, Traumatology and Sports Medicine, Central Clinical Hospital of the Ministry of Internal Affairs and Administration, 137 Woloska Street, Warsaw 02-507, Poland
3. Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK