Karami, H.; Rezaei, A. R.; Mazloomfard, M. M.; Javanmard, B.; Lotfi, B.; Haji-Mohammadmehdi-Arbab, A. Effects of Surgical Position on Patients’ Arterial Blood Gases During Percutaneous Nephrolithotomy. Urol J 2012, 9, 553-556.