1. Privett JT, Jeans WD, Roylance J. The incidence and importance of renal duplication. Clin Radiol. 1976;27(4):521–30.
2. Kaplan WE, Nasrallah P, King LR. Reflux in complete duplication in children. J Urol. 1978;120(2):220–2.
3. Huben RP, Mounzer AM, Murphy GP. Tumor grade and stage as prognostic variables in upper tract urothelial tumors. Cancer. 1988;62(9):2016–20.
4. Greenlee RT, Murray T, Bolden S, Wingo PA. Cancer statistics, 2000. CA Cancer J Clin. 2000;50(1):7–33.
5. Chen KS, Chuang CK, Wu CH, Liaw CC, Lee N. Upper urinary tract tumor in a duplicated collecting system: report of three cases and review of the literature. Chang Gung Med J. 2003 May;26(5):377–82.