Funding for this research was provided by:
the Medical and Health Research Project of Hainan Province, China (1421320.24A1005)
Text and Data Mining valid from 2019-11-09
Received: 19 May 2019
Accepted: 9 October 2019
First Online: 9 November 2019
Ethics approval and consent to participate
: This study was approved by the Research Review Committee of the Third People’s Hospital of Hainan Province. Written informed consent to participating in the study was obtained from all subjects.
: All participants were made aware of the possibility of publication of this study by signing the consent form.
: The authors declare that they have no competing interests.