1. Department of Clinical Sciences (Malmö); Social Medicine and Global Health; Lund University; Malmö Sweden
2. Department of Health Sciences; Health Sciences Centre; Lund University; Lund Sweden
3. National Centre for Quality Registers; Skåne University Hospital; Lund Sweden
4. Department of Orthopaedics; Skåne University Hospital; Malmö Sweden
5. Division of Paediatrics; Department of Clinical Sciences (Lund); Lund University; Lund Sweden