Received: 26 October 2017
Accepted: 16 August 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: Institutional review board approval was waived by the responsible Ethics Committee of Ziekenhuis Oost-Limburg, Genk, given the retrospective study design and analysis of clinical data. Patient records and information were anonymized prior to analysis in all working stages. For this type of research, a formal consent in not required. As this study is based on the patient population of the NCT02024113-trial, formal consents are available.
: Not applicable.
: The authors declare that they have no competing interests.
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