S. Arican, G. Hacibeyoglu, F. Cicekci, I. Topbal, and M. Sinan Iyisoy, “Is vitamin D deficiency associated with mortality in intensive care patients? an observational retrospective study ”, Ann Med Res , vol. 25, no. 3, pp. 0380–0385, May 2021, Accessed: Sep. 16, 2026. [Online]. Available: http://www.annalsmedres.org/index.php/aomr/article/view/1469