1. Department of Food and Nutrition, College of Human Ecology, Seoul National University, Seoul 151-742, South Korea, Smell and Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School, Fetscherstrasse 74, 01307 Dresden, Germany, and Human Stress Signal Research Center (HSS), National Institute of Advanced Industrial Science and Technology (AIST), Health Technology Research Center, Tsukuba West, 16-1 Onogawa, Tsukuba 305-8569, Japan