Comparison of contrast-enhanced ultrasound versus conventional ultrasound-guided percutaneous nephrolithotomy in patients with nondilated collecting system: a randomized controlled trial

Author(s):  
Ding Xia ◽  
Ejun Peng ◽  
Yang Yu ◽  
Xiaoqi Yang ◽  
Hailang Liu ◽  
...  
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