Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This study was supported by Research Foundation of Peking University Shenzhen Hospital (JCYJ2018005).
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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The online version of this article offers supplementary material (https://doi.org/10.1515/cclm-2019-0934).
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