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