^○Seok-Chan Kim, Hwa-Young Lee, Hye-Sun Kang, Chin Kook Lee (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, College of Medicine, Seoul, Korea)

^○Won Young Kim (Department of Emergency Medicine, Asan Medical Center, Seoul, Korea)

^○Yun Seong Kim, Dong Wan Kim, Woo Hyun Cho, Doo Soo Jeon, Seong Hoon Yoon, Hye Ju Yeo, Bong Soo Son, Do Hyung Kim (Department of Internal Medicine, Pusan National University Yangsan Hospital, Korea)