Funding for this research was provided by:
Ministerie van Volksgezondheid, Welzijn en Sport
Received: 22 February 2019
Accepted: 26 June 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: The study protocol was approved by the medical ethics committee of the VU University Medical Centre, Amsterdam, The Netherlands and the informed consent was waived because of the use of patient record data only (protocol number: 2015/430).
: Not applicable.
: The authors declare that they have no competing interest.