1 Department of Internal Medicine, Ulsan University Hospital, University of Ulsan, College of Medicine, 877 Bangeojinsunwando-ro, Dong-gu, Ulsan, Korea.
2 Department of Internal Medicine, Ulsan University Hospital, University of Ulsan, College of Medicine, 877 Bangeojinsunwando-ro, Dong-gu, Ulsan, Korea. pastnumber@hanmail.net.