Funding for this research was provided by:
The national natural science foundation of China (81502316)
The Shanghai Science and Technology Commission Funded Project (14411964100)
Article History
Received: 3 August 2017
Accepted: 22 January 2018
First Online: 6 February 2018
Ethics approval and consent to participate
: The need for ethics approval was waived by the ethics committee of Shanghai Jiao Tong University Affiliated Sixth People’s Hospital due to the retrospective nature of the study.
: Written consent was given by the patients and their relatives to use their information in a research study and publish it.
: The authors declare that they have no competing interests.
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