1. Clinical Metabolomics Center, China Pharmaceutical University, Nanjing, Jiangsu 210009, P. R. China
2. State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu 210009, P. R. China
3. School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu 210009, P. R. China