Text and Data Mining valid from 2019-04-08
Received: 2 January 2019
Accepted: 1 April 2019
First Online: 8 April 2019
Ethics approval and consent to participate
: The present study was approved by the ethics committee of Fujian Medical University, China, and adhered to the tenets of the Declaration of Helsinki. Additionally, written informed consent was obtained from the relatives of the patients.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.