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Article History

Received: 30 September 2018

Accepted: 1 March 2019

First Online: 14 March 2019

Ethics approval and consent to participate

: This study was approved by the ethics committees of all the participating centers (Additional file ) and adhered to the principles of the Declaration of Helsinki. Written informed consent was obtained from all individual participants included in the study.

: Not applicable.

: The authors declare that they have no competing interest.

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