Junbo, L.; Yugen, L.; Guo, J.; Jing, H.; Ruichao, Y.; Tao, W. Retrograde Intrarenal Surgery Vs. Percutaneous Nephrolithotomy Vs. Extracorporeal Shock Wave Lithotripsy for Lower Pole Renal Stones 10-20 Mm : A Meta-Analysis and Systematic Review. Urol J 2019, 16, 97-106.