Text and Data Mining valid from 2018-04-01
Received: 8 July 2017
Accepted: 12 October 2017
First Online: 1 April 2018
Ethical approval and consent to participate
: We did not apply for the ethics approval from Long Hua Hospital ethics committee because the study design obeyed the rule of ‘Ethics, consent and permissions’, and approved by the Food and Drug Administration of Shanghai City.Consent to publish were obtained from all the participants.
: All authors read and approved the final manuscript for publication.
: The authors declare that they have no competing interests.
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