Seroprevalence of hepatitis B and C viruses in the province of Tokat in the Black Sea region of Turkey: A population-based study - YILDIRIM, Beytullah; BARUT, Şener; BULUT, Yunus; YENİŞEHİRLİ, Gülgün; ÖZDEMİR, Metin; ÇETİN, İlhan; AKBAŞ, Ali; ATIŞ, Ömer; ÖZYURT, Hüseyin; ŞAHİN, Şemsettin (Turkish Journal of Gastroenterology, 2009)