Al-Kindi, M. K. “Vitamin D Status in Healthy Omani Women of Childbearing Age : Study of Female Staff at the Royal Hospital, Muscat, Oman”. Sultan Qaboos University Medical Journal, vol. 11, no. 1, Apr. 2011, pp. 56-61, https://journals.squ.edu.om/index.php/squmj/article/view/1547.