1. Department of Pharmacology of Chinese Materia Medica; China Pharmaceutical University; Nanjing; 210009; PR China
2. Department of Pharmacology of Traditional Chinese Medical Formulae; Nanjing University of Traditional Chinese Medicine; Nanjing; 210029; PR China
3. Department of Human Anatomy and Cell Science, Faculty of Medicine; University of Manitoba; Winnipeg; R3E 0J9; Canada