1. Centre for Bone and Arthritis ResearchInstitute of Medicine, Sahlgrenska University HospitalGothenburgSweden
2. Department of Medical SciencesUppsala University HospitalUppsalaSweden
3. Clinical and Molecular Osteoporosis Research Unit, Department of Clinical SciencesLund University and Department of Orthopaedics, Malmö University HospitalSweden