1. Skeletal Disorders and Mineral Homeostasis Section; National Institute of Dental and Craniofacial Research; National Institutes of Health; Bethesda MD USA
2. Musculoskeletal Research group; Hospital del Mar Research Institute; Barcelona Barcelona (Spain)
3. National Research Council; Institute of Clinical Physiology; Lecce Italy
4. Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of Social Health Insurance Vienna (WGKK) and Austrian Social Insurance for Occupational Risk (AUVA) Trauma Centre Meidling; 1st Medical Department; Hanusch Hospital; Vienna Austria
5. Columbia University College of Physicians & Surgeons; New York NY USA
6. Regional Bone Center; Helen Hayes Hospital; West Haverstraw NY USA