LeBlanc ES, Desai M, Perrin N, Wactawski-Wende J, Manson JE, Cauley JA, Michael YL, Tang J, Womack C, Song Y, Johnson KC, O'Sullivan MJ, Woods N, Stefanick ML. Vitamin D levels and menopause-related symptoms. Menopause. 2014 Nov; 21(11):1197-203.