Vitamin D Deficiency

• BC Children's Hospital — Vancouver, British Columbia, Canada
• McMaster University — Hamilton, Ontario, Canada

Not specified

• Department of Dermatology, Lund University Malmoe — Malmö, Sweden

• Baylor College of Medicine — Houston, Texas, United States
• Ben Taub General Hospital — Houston, Texas, United States
• St Lukes Episcopal Hospital — Houston, Texas, United States

• University of Wisconsin Osteoporosis Clinical and Research Program — Madison, Wisconsin, United States

• Chu Pitie Salpetriere — Paris, France
• Hopital la Pitie Salpétrière — Paris, France
• Nathalie Costedoat-Chalumeau — Paris, France

• Meir medicalc enter — Kfar Saba, Israel

• Georgia Prevention Institute at Medical College of Georgia — Augusta, Georgia, United States

• USDA, ARS, Western Human Nutrition Research Center — Davis, California, United States

• Children's Hospital , University of Alabama — Birmingham, Alabama, United States