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Article History

Received: 19 January 2018

Accepted: 25 April 2018

First Online: 3 May 2018

Ethics approval and consent to participate

: The Ruijin Hospital Ethics Committee approved the study protocol and obtaining informed consent verbally, because this study only involved patients stool samples and all data collected were anonymized. All participants provided verbal consent prior to participation.

: The authors declare that they have no competing interests.

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