Relationship between mutations in the pre-core/core promoter region and HBe antigen status in patients with chronic HBV infection - BOZKAYA, Hakan; BOZDAYI, Mithat; UZUNALİMOĞLU, Özden and ÇETİNKAYA, Hülya and YURDAYDIN, Cihan and KARAYALÇIN, Selim and LOK, Anna SF (Turkish Journal of Gastroenterology, 1997)