1. Narcotic & Neuropharmacological Drug Division, Drug Evaluation Department, Korea Food and Drug Administration, Seoul, 122-020, Korea, Herbal Medicinal Products Division, Herbal Medicines Evaluation Department, Korea Food and Drug Administration, Seoul, 122-020, Korea, College of Pharmacy, Yeungnam University, Gyeongsan, 712-749, Korea, College of Pharmacy, Catholic University of Daegu, Gyeongsan, 712-702, Korea, and Nature's Sunshine Products, 1655 N. Main Street, Spanish Fork, Utah 84660