1Department of Radiology, UMC Utrecht, Utrecht, Netherlands, 2Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark, 3Danish Dementia Research Centre, Department of Neurology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark, 4Musculoskeletal Rehabilitation Research Unit and Institute of Sports Medicine, Bispebjerg Hospital, University of Copenhagen, Copenhagen, Denmark