Funding for this research was provided by:
Academic and Technical Leader’s Foundation of Sichuan Province (No.2016-183-31)
Article History
Received: 13 April 2019
Accepted: 15 October 2019
First Online: 28 October 2019
Compliance with ethical standards
:
: The authors declared no potential conflicts of interest.
: This retrospective study was approved by the Institutional Review Board of West China Second University Hospital.
: For this type of study, formal consent is not required. This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.