Affiliation: | aInstitute of Diagnostic Radiology, Department of Medical Radiology, University Hospital Zurich, Switzerland;bOsteoporosis Center, University Hospital Zurich;cCenter for Rheumatology and Bone Disease, Klinik im Park, Zurich, Switzerland;dDepartment of Biostatistics, University of Zurich, Switzerland;eDepartment of Rheumatology and Institute of Physical Medicine, University Hospital Zurich, Switzerland |