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Article History

Received: 17 July 2018

Accepted: 18 September 2018

First Online: 30 October 2018

Ethics approval and consent to participate

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study passed the local scientific board and approval of the local ethical committee for the present study was waived since the study does not fall within the scope of the Dutch Medical Research Involving Human Subjects Act (section 1.b WMO, 26th February 1998). As a result the need for informed consent was waived for this retrospective study.

: The authors declare that they have no competing interests.

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