Yang, Bo
Sun, Li
Liang, Lei
Article History
Received: 5 August 2019
Accepted: 27 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: This study was approved by Ethics Committee of Bethune International Peace Hospital. The study followed the tenets of the Declaration of Helsinki, and informed written consent was obtained from all patients and controls after we explained the nature and possible consequences of the study.
: Not applicable.
: The authors declare that they have no competing interests.