Cetinel, T.T., Gokce, S.F., Yildirim, M.E. and Bolayir, A. 2021. Effects of ApaI, FokI, and BsmI gene polymorphisms of the vitamin D receptor on serum vitamin D level in Turkish MS patients with different types and severities of the disease. Annals of Medical Research. 28, 11 (Nov. 2021), 2019–2025.