Corresponding author
Jun Kyu Lee, MD, PhD. Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, 27 Dongguk-ro, Ilsandong-gu, Goyang 10326, Korea.
Tel: +82-31-961-7750, Fax: +82-31-961-9390, E-mail:jeromee1971@yahoo.co.kr