[1] The Institute of Chest Disease,Division of Pulmonology, Department of Internal Medicine
[2] Severance Hospital,Division of Health and Nutrition Survey
[3] Yonsei University College of Medicine,Department of Pulmonary and Critical Care Medicine, and Asthma Center, Asan Medical Center
[4] Yuhan Research Institute,Department of Nursing, College of Medicine
[5] Korea Centers for Disease Control and Prevention,undefined
[6] University of Ulsan College of Medicine,undefined
[7] Chosun University,undefined