PALABIYIKOĞLU, Murat, Nurcan ÇETİNKAYA, Nihat SİPAHİ, Ali ÖZDEN, Kadir BAHAR, and Özden UZUNALİMOĞLU. 1995. “Serum Retinol and Beta-Carotene Levels in Liver Cirrhosis”. Turkish Journal of Gastroenterology 6 (3):337-42. https://www.turkjgastroenterol.org/index.php/tjg/article/view/643.