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Article History

Received: 31 January 2018

Accepted: 18 July 2018

First Online: 27 July 2018

Ethics approval and consent to participate

: This study was conducted with approval from the Affiliated hospital of Guizhou Medical University and was performed in accordance with the Declaration of Helsinki. Oral and written informed consent was obtained from all individual participants included in the study.

: Not applicable.

: All named authors declare that they have no competing interest with respect to the research, authorship, and/or publication of this article.

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