Hepatitis B carriage and Brucella seroprevalence in urban and rural areas of Bolu province of Turkey: A prospective epidemiologic study - KARABAY, Oğuz; SERİN, Erdinç; TAMER, Ali; GÖKDOĞAN, Feray; ALPTEKER, Hacer; ÖZCAN, Arzu; GÜNDÜZ, Hüseyin (Turkish Journal of Gastroenterology, 2004)