Affiliation: | 1.Division of Paediatrics, Department of Clinical Sciences (Lund),Lund University,Lund,Sweden;2.Division of Physiotherapy, Department of Health Sciences,Lund University,Sweden;3.Swedish National Competence Centre for Musculoskeletal Disorders (NKO), Department of Orthopaedics,Sk?ne University Hospital,Lund,Sweden;4.Children's Hospital, Sk?ne University Hospital,Lund,Sweden |