1. Ningbo Combireg Pharmaceutical Technology Co., Ltd., Ningbo 315336, P. R. China
2. School of Pharmaceutical Sciences, Tsinghua University, Haidian Dist, Beijing 100084, P. R. China
3. School of Biomedical Engineering, Tsinghua-Peking Center for Life Sciences, Tsinghua University, Haidian Dist, Beijing 100084, P. R. China