1. Graduate School of Medicine, Dongguk University, Seoul, Republic of Korea.
2. Cardiovascular Center, Dongguk University Ilsan Hospital, Goyang, Gyeonggi, Republic of Korea.
3. Division of Cardiology, Department of Internal Medicine, College of Medicine, Dongguk University, Gyeongju, Republic of Korea.
4. Department of Dental Hygiene, College of Health Science, Eulji University, Seongnam, Republic of Korea.