Funding for this research was provided by:
Program of Shenzhen Science and Technology (200903002)
Text and Data Mining valid from 2019-08-08
Received: 12 January 2019
Accepted: 23 July 2019
First Online: 8 August 2019
Ethics approval and consent to participate
: The present study was approved by the medical ethics committee of Shenzhen People’ Hospital (Shenzhen, China). Informed consent was not needed because the study was observational and retrospective. Data were anonymized.
: The authors declare that they have no competing interests.