Article History
Received: 17 January 2019
Revised: 9 April 2019
Accepted: 25 April 2019
First Online: 16 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The procedures followed ethical standards of the Declaration of Helsinki 1975, as revised in 1983 and were approved by the Biomedical Research Ethics Committee of West China Hospital of Sichuan University.
: Informed consent was obtained from all individual participants included in the study.