Acknowledgments
We’re grateful for the valuable comments of the reviewers and the kind help from Dr. Xueyan Han (Department of Medical Statistics, Peking University First Hospital, Beijing, China) in language editing.
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Research funding: None declared.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: Authors state no conflict of interest.
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Informed consent: This study was approved for the exemption from informed consent.
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Ethical approval: Not applicable.
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