1Institute of Medical Physics, University of Erlangen, Germany
2Synarc, Hamburg, Germany
3Department of Clinical Radiology, Division of Imaging Science and Biomedical Engineering, University of Manchester, UK
4Center of Muscle and Bone Research, Charite—University Medicine Berlin, Germany
5Biomechanics Research Laboratory, Trauma Center, Murnau, Germany
6Department of Clinical Research, Instituto de Investigaciones Metabolicas, Buenos Aires, Argentina
7Department of Orthopedic Surgery, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
8Department of Radiology, Charite—University Medicine Berlin, Germany
9Division of Radiology, Nagasaki University Hospital, Nagasaki, Japan
10Department of Radiology, University of California, San Francisco, CA, USA
11Division of Nuclear Medicine, Geneva University Hospital, Switzerland
12New Mexico Clinical Research & Osteoporosis Center, Albuquerque, NM, USA