1. Department of Physiology and Pathophysiology, Yanbian University College of Medicine, Yanji 133002, China.
2. Department of Oral Physiology, Wonkwang University College of Dentistry, Iksan 570-749, Korea.
3. Department of Food and Nutrition, Kwangju Women's University, Gwangju 506-713, Korea.
4. Department of Physiology, Wonkwang University School of Medicine and Brain Science Institute at Wonkwang University, Iksan 570-749, Korea.