Text and Data Mining valid from 2019-09-04
Received: 18 April 2019
Accepted: 9 August 2019
First Online: 4 September 2019
Ethics approval and consent to participate
: Approval of the Medical Ethical Committee of the Leiden University Medical Center and local Ethical Committees was obtained prior to start at each study site. Written Informed consent was obtained from patients above 12 years of age and parents of all participating patients.
: All authors agreed with the final version to be submitted. This study has not been published elsewhere, or is not currently submitted elsewhere.
: The authors declare that they have no competing interests.