Yu Hyeon Choi, Do Kyun Kim, Eun Kyeong Kang, Jin-Tae Kim, Jae Yoon Na, Bobae Park, Seok Ran Yeom, Joo Suk Oh, Jisook Lee, Won Kyoung Jhang, Soo In Jeong, Jin Hee Jung, Jea Yeon Choi, June Dong Park, Sung Oh Hwang, on behalf of the Steering Committee of 2020 Korean Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care