1 Division of Respiratory and Allergy Medicine, Department of Internal Medicine, Soonchunhyang University Gumi Hospital, Gumi, Korea.
2 Division of Respiratory and Allergy Medicine, Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Seoul, Korea.
3 Division of Hematology and Thromboembolism, Department of Medicine, Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences (Hamilton General Site), McMaster University, Hamilton, ON, Canada.
4 Department of Obstetrics and Gynecology, I.M. Sechenov First Moscow State Medical University, Moscow, Russia.