Funding for this research was provided by:
the Key research base of humanistic and social sciences of Sichuan department of education- Sichuan hospital management and development research center (SCYG2017-32)
Article History
Received: 21 July 2016
Accepted: 2 May 2018
First Online: 8 May 2018
Ethics approval and consent to participate
: This study was approved by the hospital ethics committee of Zigong Fourth People’s Hospital and Sichuan Provincial People’s Hospital. All of the patients gave informed consent before undergoing the operation. The principles of the Helsinki Declaration were followed in this study.
: The authors declare that they are no competing interest.
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