1 Department of Orthopaedics, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, 431 80, Mölndal, Gothenburg, Sweden. jon.kssta@gmail.com.
2 Department of Orthopaedic Surgery, Center for Sports Medicine, UPMC Rooney, Pittsburgh Medical Center, 3200 S Water Street, Pittsburgh, PA, 15203, USA.
3 Department of Orthopaedic Surgery and Traumatology, Kantonsspital Baselland (Bruderholz LiestalLaufen), 4101, Bruderholz, Switzerland.