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APA Citation
Kadlec, A. O., Greco, K. A., Fridirici, Z. C., Hart, S. T., Vellos, T. G., & Turk, T. M. (n.d.). comparison of complication rates for unilateral and bilateral percutaneous nephrolithotomy (PCNL) using a modified Clavien grading system. BJU international, 111, E243–E248. http://access.bl.uk/ark:/81055/vdc_100039047200.0x000001