Guo, J. (2018) “Clinical effects of Poly- Flexible Ureteroscopy combined with ultrasound guided all seeing needle Microperc to treatment of Lower Pole Renal Calculi larger than 2cm with infundibulopelvic angle less than 60 degrees”, Journal of Current Medical Research and Opinion, 1(3). doi: 10.15520/jcmro.v1i3.21.