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 and ÖZDEMİR, Metin and; N, İlhan and AKBAŞ, Ali and ATIŞ, Ömer and ÖZYURT, Hüseyin and ŞAHİN, Şemsettin (Turkish Journal of Gastroenterology, 2009)