Jaehoon Oh, Kyoung-Chul Cha, Jong-Hwan Lee, Seungmin Park, Dong-Hyeok Kim, Byung Kook Lee, Jung Soo Park, Woo Jin Jung, Dong Keon Lee, Young Il Roh, Tae Youn Kim, Sung Phil Chung, Young-Min Kim, June Dong Park, Han-Suk Kim, Mi Jin Lee, Sang-Hoon Na, Gyu Chong Cho, Ai-Rhan Ellen Kim, Sung Oh Hwang, on behalf of the Steering Committee of the 2020 Korean Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care