Article History
Received: 18 March 2019
Accepted: 5 June 2019
First Online: 12 June 2019
Compliance with ethical standards
:
: The authors declare that there are no competing interests.
: Ethics approval has been obtained from the Institutional Review Board and the Human Ethics Committee of Xuanwu Hospital. Capital Medical University.
: Informed consent was obtained from all individual participants included in the study.