1. Skeletal Disorders and Mineral Homeostasis Section National Institute of Dental and Craniofacial Research, National Institutes of Health Bethesda MD USA
2. Musculoskeletal Research Unit Hospital del Mar Medical Research Institute, Centro de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES) Barcelona Spain
3. Biostatistics and Clinical Epidemiology Services (XL) National Institutes of Health Bethesda MD USA