Received: 23 December 2019
Accepted: 11 March 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: The study was approved by the medical ethics committee of Chinese PLA General Hospital (S2019–166-01) and registered at Chinese Clinical Trial Registry (the clinical trial registration number: ChiCTR1900025730). All procedures were conducted in compliance with the guidelines of the Declaration of Helsinki. The patients gave written, informed consent prior to their participation in the study.
: We have obtained written consent for publication.
: The authors declare that they have no competing interests.