Agin, K, and SH Ardehali. “Assessment of Perioperative Risk Factors; Medical Disorders, ASA Classifications, MRC Scale, Smoking and Opium Habit Among Elderly Patients for Elective Surgery: Tehran-Iran”. International Journal of Medical Toxicology and Forensic Medicine 2, no. 2(spring) (September 20, 2012): 64–70. Accessed May 7, 2024. https://journals.sbmu.ac.ir/ijmtfm/article/view/IJMTFM.3253.