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Article History

Received: 4 July 2018

Accepted: 8 October 2018

First Online: 19 October 2018

Ethics approval and consent to participate

: All procedures performed in this study involving the patients were in accordance with the ethical standards of the institutional, the national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This retrospective study was approved by the Medical Ethical Committee of the University Hospitals Leuven (reference number S54875).

: Not applicable

: The authors declare that they have no competing interests.

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