Cardiopulmonary resuscitation (CPR) training strategies in the times of COVID-19: a systematic literature review comparing different training methodologies. - Ali DM; Hisam B; Shaukat N; Baig N; Ong MEH; Epstein JL; Goralnick E; Kivela PD; McNally B; Razzak J (Scandinavian journal of trauma, resuscitation and emergency medicine, 2021)