Panicker, L. C., & Prasanna, K. K. A. (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), 602–607. Retrieved from http://www.sciencescholar.us/journal/index.php/ijhs/article/view/11188