1. State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P. R. China
2. Chemmind Technologies Co., Ltd., Beijing 100085, P. R. China
3. Key Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, P. R. China
4. Center for Imaging and Systems Biology, Minzu University of China, Beijing 100081, P. R. China