Wang, Yu, et al. “The Role of Dispatcher Assisted Cardiopulmonary Resuscitation in Out-Of-Hospital Cardiac Arrest: A Systematic Review and Meta- Analysis”. Cardiology and Cardiovascular Medicine, vol. 4, no. 1, Jan. 2020, pp. 9-20, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15775.