Funding for this research was provided by:
National Natural Science Foundation of China (81371294, 81501022, 81401029)
Received: 5 February 2018
Accepted: 6 March 2018
First Online: 19 March 2018
Ethics approval and consent to participate
: The study was approved by the Ethics Review Committee of Drum Tower Hospital. Written informed consents were obtained from the patients or their family members.
: Not applicable.
: The authors declare that they have no competing interests.
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