1. Metabolic Bone Diseases Unit; Department of Rheumatology; Hospital Clinic; IDIBAPS; CIBERehd, University of Barcelona; Barcelona Spain
2. Center for Metabolic Bone Disease and Molecular Research; Shriners Hospital for Children; St. Louis MO USA
3. Division of Bone and Mineral Diseases; Washington University School of Medicine; St. Louis MO USA
4. Institute Poal of Rheumatology; Barcelona Spain
5. Immunology Department; Hospital Clinic; Barcelona Spain
6. Musculoskeletal Disease Section; Mallinckrodt Institute of Radiology at Barnes-Jewish Hospital; St. Louis MO USA