Serum retinol and beta-carotene levels in liver cirrhosis - PALABIYIKOĞLU, Murat; ÇETİNKAYA, Nurcan and SİPAHİ, Nihat and ÖZDEN, Ali and BAHAR, Kadir and UZUNALİMOĞLU, Özden (Turkish Journal of Gastroenterology, 1995)