Author contributions:
Qi Wang: Concept/design, Statistics, Data analysis/interpretation,
Drafting article
Han Song: Concept/design, Statistics, Data analysis/interpretation
Zhenhua Wang: Statistics, Data collection
Duoliang Wei: Statistics, Data collection
Kai Xu: Data collection
Bowen Li: Data collection
Jun Zhang: Concept/design, Critical revision of article
Xin Zhao: Concept/design, Critical revision of article, Approval of
article, Funding secured by