Received: 4 December 2018
Accepted: 29 May 2019
First Online: 10 July 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the declaration of Helsinki.This study was conducted with approval from the Ethics Committee of Tongren Hospital of Capital Medical University.Written informed consent was obtained from all participants.
: Consent for publication was obtained from every individual whose data are included in this manuscript.
: All authors have contributed significantly to the manuscript and declare that the work is original and has not been submitted or published elsewhere. None of the authors have any financial disclosure or conflict of interest.