Hyungjun Park (Department of Pulmonology, Shihwa Medical Center, Siheung, Republic of Korea, Helpmedoc Inc., Republic of Korea), Chang-Yun Woo (Department of Internal Medicine, Asan Medical Center, Seoul, Republic of Korea), Seungjo Lim (Helpmedoc Inc., Republic of Korea), Seunghwan Lim (Helpmedoc Inc., Republic of Korea), Keunho Kwak (Helpmedoc Inc., Republic of Korea), Ju Young Jeong (Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea), Chong Hyun Suh (Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea)