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