Text and Data Mining valid from 2018-05-01
Received: 11 February 2017
Accepted: 16 March 2018
First Online: 1 May 2018
Ethics approval and consent to participate
: The study protocol was approved by Ethics Committee of Chinese People’s Liberation Army General Hospital (Beijing, China). Each participant provided written informed consent to be included in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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