The role of color Doppler ultrasonography in the differentiation of gallbladder lesions - ERDEN, Ayşe; SONGÜR, Yıldıran; ŞAHİN, Tülin and ALİMOĞLU, Emel and CUMHUR, Turhan and TEMUÇİN, Gülay (Turkish Journal of Gastroenterology, 1999)