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Contributors GX wrote the first draft of the manuscript and submitted the manuscript. HX and HY were in charge of the patient and collected the clinical data. SD and YM critically revised the manuscript. All authors approved the final version.
Funding This study was funded by CAMS Innovation Fund for Medical Sciences (CIFMS) (No. 2016-I2M-1-001) and the National High-tech Research and Development Projects (863) (No. 2015AA020303).
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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