Funding for this research was provided by:
National Natural Science Foundation of China (AA803)
Natural Science Foundation of Jiangsu Province (KA1138)
Text and Data Mining valid from 2019-03-30
Received: 8 February 2019
Accepted: 5 March 2019
First Online: 30 March 2019
Ethics approval and consent to participate
: According to the principles of Declaration of Helsinki of 1975, the retrospective study was approved by the Clinical Research Ethics Committee of the Drum Tower Hospital. All participants were verbally informed about the study. Written informed consent was waived due to retrospective and observational nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
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