1 Department of Internal Medicine A, University Medicine Greifswald, Germany.
2 Clinic for Surgery and Trauma Surgery, St. Josef Hospital Essen, Essen-Werden, Germany.
3 Center for Orthopedics, Trauma Surgery and Rehabilitation Medicine, Clinic and Outpatient Clinic for Orthopedics and Orthopedic Surgery, University Medicine Greifswald, Germany.