Prospective comparison of endoscopic ultrassonography (EUS) and endoscopic retrograde cholangiography (ERC) in the diagnosis of choledocholitiasis: the influence of the duct diameter and the stone size - Ney, Marcus V. S.; Maluf Filho, Fauze; Sakai, Paulo; Zilberstein, Bruno; Gama Rodrigues, Joaquim José; Rosa, Heitor (ASGE Meeting, 2003)