Endoscopic ultrasound versus endoscopic retrograde cholangiography for the diagnosis of choledocholithiasis: the influence of the size of the stone and diameter of the common bile duct - Ney, Marcus Vinicius Silva; Maluf Filho, Fauze; Sakai, Paulo; Zilberstein, Bruno; Gama Rodrigues, Joaquim José; Rosa, Heitor (Arquivos de Gastroenterologia, 2005)