Funding for this research was provided by:
Science and Technology Supportive Project of Sichuan Province (2015SZ0051)
1.3.5 project for disciplines of excellence, West China Hospital, Sichuan University (ZY2016102)
Article History
Received: 3 July 2017
Accepted: 17 August 2017
First Online: 1 September 2017
Compliance with ethical standards
:
: None
: This review required no ethical approval.