1. Department of Orthopaedic Surgery, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, Aarhus N, Denmark
2. Department of Clinical Medicine, Aarhus University, Incuba Skejby, building 2, Palle Juul-Jensens Boulevard 82, Aarhus N
3. Department of Public Health, Aarhus University, Bartholins Allé 2, Aarhus C, Denmark