Vitamin D Deficiency

• Clinical Trial Unit, Orthopedic Department, Wuerzburg University — Würzburg, Germany

• National Institutes of Health Clinical Center — Bethesda, Maryland, United States

• Saint-Petersburg State University Hospital — Saint Petersburg, Russia

• Department of Medicine, Division of Cardiology, Pulmonary Diseases and Vascular Medicine at the University Hospital, RWTH Aachen — Aachen, North Rhine-Westphalia, Germany
• Clinic for Nephrology and Diabetology, Hospital St. Franziskus (Maria-Hilf-Clinic) — Mönchengladbach, North Rhine-Westphalia, Germany

• Hôpital Femme mère enfant — Bron, France
• Hôpital Edouard Herriot — Lyon, France
• Hôpital Bicêtre Paris Saclay — Paris, France

• Kanagawa Prefectural Hospital Organization Kanagawa Children's Medical Center — Yokohama, Kanagwa, Japan
• Osaka Hospital, Japan Community Healthcare Organization (JCHO) — Osaka, Japan
• National University Corporation Osaka University Hospital — Suita, Osaka, Japan
• Okayama Saiseikai General Hospital Outpatient Center — Okayama, Japan

• prof. Tarasenko Svetlana — Moscow, Russia
• Vladimir Grachev — Moscow, Russia

• Wake Forest University Health Sciences — Winston-Salem, North Carolina, United States

Not specified

• CHU de Bicetre — Le Kremlin-Bicêtre, France
• Hopital Lariboisiere — Paris, France
• Hopital Cochin — Paris, France
• St. Vincent's University Hospital — Dublin, Ireland