Seungsoo Sheen1, Keu Sung Lee1, Wou Young Chung1, Saeil Nam2, Dae Ryong Kang2
1Department of Pulmonary and Critical Care Medicine, Ajou University School of Medicine, Suwon, Republic of Korea.
2Department of Humanities and Social Medicine, Ajou University School of Medicine, Suwon, Republic of Korea.