1. Department of Foodservice Management and Nutrition, Sangmyung University, Seoul 110-743, Korea.
2. Corresponding authors. (Han) Phone: 82-2-2287-5357. Fax: 82-2-2287-0071. E-mail: vividew@smu.ac.kr. (Lim) Phone: 82-2-3290-3435. Fax: 82-2-927-5201. E-mail: limst@korea.ac.kr
3. School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea.