Sevimli, Resit, Mehmet Esref Encan, Semih Eriten, Okan Aslanturk, and Yunus Oklu. 2021. “Relation of Vitamin D Levels With Sunlight, Genetics and Nutrition”. Annals of Medical Research 26 (7):1141-44. https://annalsmedres.org/index.php/aomr/article/view/1309.