Document is current

Article History

Received: 21 February 2019

Accepted: 30 April 2019

First Online: 14 May 2019

Ethics approval and consent to participate

: This study was approved by the Ethics Committee of the General Hospital of People's Liberation Army and in accordance with the standards of the National Research Council. Written informed consent was obtained from all participants.

: 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.