A cross-sectional study on the association of level of Vitamin D with severity of fibromyalgia syndrome in a tertiary care hospital, Kolkata. - Sen, Mausumi; Das, Sulagna; Sen, Santanu; Biswas, Nabanita Baidya; Naskar, Tanmoy; Mishra, Swapan Kumar; Bhattacharyya, Swati (Asian Journal of Medical Sciences, 2024)