Vitamin D deficiency and biochemical variations among urban Saudi adolescent girls according to season

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada

From the Department of Medicine (Sulimani, Alfadda), Community and Family Medicine (Mohammed), Obesity Research Center (Alfadda), College of Medicine, Department of Community Health Sciences (Al-Othman), College of Applied Medical Sciences, Department of Biochemistry (Al-Daghri), College of Science, King Saud University, the Department of School Health (Alshehri), Ministry of Health, Riyadh, Kingdom of Saudi Arabia, and the Department of Medicine (Hanley), McCaig Institute for Bone and Joint Health, Calgary, and the Divisions of Endocrinology and Geriatrics (Khan), McMaster University, Oakville, Canada