Pishgahi, Mehdi, Rama Bozorgmehr, Masoud Rastgari, and Mohammad Amin Abbasi. “Effect of Nocturnal Oxygen Therapy on Electrocardiographic Changes Among Patients With Congestive Heart Failure”. International Journal of Cardiovascular Practice 1, no. 2 (August 2, 2016): 33-35. Accessed September 20, 2021. https://journals.sbmu.ac.ir/ijcp/article/view/13411.