Authorship statement
(I) Conception and design: Li Wang, Guorong Fan
(II) Administrative support: Min Zhang
(III) Provision of study materials or patients: Wuping Bao,
Aihua Bao, Ping Shao
(IV) Collection and assembly of data: Jiaqi Wu, Lin Mao,
Zhendong Pan
(V) Data analysis and interpretation: Li Wang, Zhenghua Wu
(VI) Manuscript writing: Li Wang
(VII) Final approval of manuscript: All authors