Received: 24 February 2019
Accepted: 1 October 2019
First Online: 8 November 2019
Ethics approval and consent to participate
: This retrospective study was not subject to the Dutch Medical Research Involving Human Subjects (WMO) act as was determined by the Medical Ethics Committee of the Amsterdam UMC, Vrije Universiteit Amsterdam.
: Not applicable.
: The athors declare that they have no competing interests.