The authors wish to thank the Editor, Dr. Yi, the Associate Editor, and two referees for their many helpful comments and suggestions. This work was partly supported by the US National Institutes of Health grants (R03 CA219450, R21 CA198641), the National Nature Science Foundation of China (Nos. 11471135, 11571133), and the self-determined research funds of CCNU from the college’s basic research of MOE (CCNU15ZD011, CCNU18ZDPY08).