Funding for this research was provided by:
foundation of Innovation seeding project of Science & Technology Department of Sichuan Province (2017-64)
The cooperative project of Nanchong City with North Sichuan Medical College (NSMC20170461)
Article History
First Online: 7 March 2018
Compliance with Ethical Standards
: This study was approved by the Ethics Committee of Nanchong Central Hospital
: The authors declare that they have no conflicts of interest.