Osteopenia

• UMDNJ-Robert Wood Johnson Medical School, Department of Medicine, Division of Endocrinology — New Brunswick, New Jersey, United States

• Site 1 — Barcelona, Spain
• Site 2 — Barcelona, Spain
• Site 3 — Barcelona, Spain

• VA Puget Sound Health Care System — Seattle, Washington, United States

• McGill University Health Center - Montreal Children's Hospital — Montreal, Quebec, Canada

• Centre for Muscle and Bone Research, Charité - Campus Benjamin Franklin — Berlin, Germany
• Centre for Muscle and Bone Research, Aerpah-Kliniken Esslingen — Stuttgart, Germany

Not specified

Not specified

• Division for Endocrinology and Metabolism, Department of Medicine 3, Medical University Vienna — Vienna, Austria
• Department of Rheumatology, Charité Universitätsmedizin Berlin, Charite Campus Mitte — Berlin, State of Berlin, Germany
• Centre of Muscle and Bone Research (ZMK), Charité Universitätsmedizin Berlin, Campus Benjamin Franklin — Berlin, State of Berlin, Germany
• Department for Orthopedy, Trauma and Reconstructive Surgery, Section of Geriatric Traumatology, University Hospital Halle (Saale) — Halle, Germany

• Odense University Hospital — Odense, Denmark

• UC Davis Comprehensive Cancer Center — Sacramento, California, United States