?:authorAffiliation
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[\'Department of Preventive Medicine, Korea University College of Medicine, Seoul 02841, Korea.\', \'Department of Preventive Medicine, Kyung Hee University College of Medicine, Seoul 02447, Korea.\', \'Division of Pulmonary, Sleep and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Ansan-si 15355, Korea.\']
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