APPLICATION OF MICRO-PERCUTANEOUS NEPHROLITHOTOMY (MICRO-PCNL) COMBINED WITH FURL IN 1-2 CM SYMPTOMATIC, REFRACTORY LOWER CALYCEAL STONES Article Shi Xiao-qiang, Ma Tao, Wang Wentao, Cui Zhenyu, Li Xin-yao, Gao Ying Pakistan Journal of Medical Sciences. Professional Medical Publications. Vol. 39. 2023.