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Article History

Received: 22 February 2017

Accepted: 5 February 2018

First Online: 13 February 2018

Ethics approval and consent to participate

: This study was approved by the local ethics committee of Gustave Roussy (n°26/007). The parents/guardians gave their written informed consent for the retrospective analysis of clinical data according to the institutional review board of the Gustave Roussy Campus.

: Not applicable.

: The authors declare that they have no competing interests.

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