From the 1Department of Family Medicine, Chung-Ang University Medical Center, Seoul, Korea; 2Department of Physiology, College of Medicine, Chung-Ang University, Seoul, Korea; and 3Department of Family Medicine, Severance Hospital, Yonsei University, College of Medicine, Seoul, Korea.
Received November 3, 2011; revised and accepted February 14, 2012.
Funding/support: This research was supported by a Chung-Ang University research grant in 2011.
Financial disclosure/conflicts of interests: None reported.
Address correspondence to: Hyoweon Bang, MD, PhD, Department of Physiology, College of Medicine, Chung-Ang University, 221 Heukseok-Dong, Dongjak-Gu, Seoul, Korea 156-756. E-mail: [email protected]