1. Ludwig Boltzmann Institute of Osteology; Hanusch Hospital of Wiener Gebietskrankenkasse (WGKK); Vienna Austria
2. Allgemeine Unfallversicherungsanstalt (AUVA) Trauma Centre Meidling, 1st Medical Department; Hanusch Hospital; Vienna Austria
3. Max Planck Institute of Colloids and Interfaces; Potsdam Germany
4. Dept. of Endocrinology, Morbid Obesity and Preventive Medicine; Oslo University Hospital; Aker Norway
5. Genetics Unit; Shriners Hospital for Children and McGill University; Montreal QC Canada
6. Medicine and Pathology; College of Physicians and Surgeons of Columbia University; New York NY USA
7. Osteoporosis Research Center; Creighton University; Omaha NE USA