Text and Data Mining valid from 2020-01-14
Received: 5 April 2019
Accepted: 8 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: The institutional ethics committee of Shanghai Changzheng hospital approved the study (2017S226) and stated that there are no ethical or legal concerns regarding this study. The study was conducted in accordance with the Declaration of Helsinki. All patients provided written informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interest.