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Article History

Received: 17 January 2018

Accepted: 28 March 2018

First Online: 17 April 2018

Ethics approval and consent to participate

: After approval by the ELSO Registry Committee, limited de-identified datasets are released to participating centers for research purposes without the need for further approval from individual centers. No patient consent is required. This study was conducted in accordance with the amended Declaration of Helsinki.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.