Panicker, Lalitha Chandrashekhar, and Kumari K A Prasanna. 2019. “Evaluation of Serum Vitamin D Levels and Their Correlation With Menstrual Irregularities in Reproductive-Aged Women: A Cross-Sectional Study”. International Journal of Health Sciences 3 (S1):602-7. http://www.sciencescholar.us/journal/index.php/ijhs/article/view/11188.