1. Modern Research Center for Traditional Chinese Medicine, Beijing University of Chinese Medicine, No. 11 North 3rd Ring Road East, Chaoyang District, Beijing 100029, P. R. China, (phone/fax: +86‐10‐64286350)
2. School of Chinese Materia Medica, Beijing University of Chinese Medicine, No. 6 Wangjing Southern Middle Ring Road, Chaoyang District, Beijing 100102, P. R. China