Authors’ contributions
Conception and design: QO. Acquisition of data: ZH, MY, HX, LR, JZ, TL, TS, NX, LL, XY, HX, JL, BL, QO. Analysis and interpretation of data: ZH and QO. Drafting of the manuscript: ZH. Final approval of the manuscript: ZH, MY, HX, LR, JZ, TL, TS, NX, LL, XY, HX, JL, BL, QO.