Text and Data Mining valid from 2018-05-03
Received: 5 November 2017
Accepted: 3 April 2018
First Online: 3 May 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Chinese PLA General Hospital and was performed in accordance with the ethical standards of the Declaration of Helsinki of 1964. Consent to participate was obtained from the participants or their parent/legal guardian for patients who were <16 years old.
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