Lai, D. et al. 2020. Minimally Invasive Percutaneous Nephrolithotomy with a Novel Vacuum-assisted Access Sheath for obstructive calculous pyonephrosis ：A Randomized Study. Urology Journal. 17, 05 (Jul. 2020), 474–479. DOI:https://doi.org/10.22037/uj.v17i05.5577.