Khan AA, Sajjad M, Yasrab M, Alvi MS. RETROGRADE AIR INJECTION FOR IDENTIFYING PRECISELY POSTERIOR CALYX: A VERY USEFUL TOOL WHILE PERFORMING MINI-PERCUTANEOUS NEPHROLITHOTOMY. PAFMJ [Internet]. 2019 Jun. 26 [cited 2024 Apr. 30];69(3):600-04. Available from: https://www.pafmj.org/PAFMJ/article/view/3038