Agin, K., & Ardehali, S. (2012). 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(2(spring), 64–70. https://doi.org/10.22037/ijmtfm.v2i2(spring).3253