6Elbahnasy AM, Shalhav AL, Hoenig DM, et al. Lower caliceal stone clearance after shock wave lithotripsy or ureteroscopy: the impact of lower pole radiographic anatomy. J Urol, 1998,159:676-682.
7Dretler SP. Ureteroscopy for proximal ureteral calculi:prevention of stone migration. J Endouro1,2000,14:565-567.
9Smith RC, Rosenfield AT, Choe KA, et al. Acute flank pain: comparison of non-contrast-enhanced CT and intravenous urography[J]. Radiology, 1995, 194(3):789-794.
10Levine JA, Neitlich J, Verga M, et al. Ureteral calculi in patients with flank pain: correlation of plain radiography with unenhanced helical CT[J]. Radiology, 1997, 204(1):27-31.
