Funding for this research was provided by:
Hutchison Whampoa Limited
Article History
Received: 3 July 2019
Accepted: 8 November 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: Written informed parental consent was obtained for participation in the study, also for any minors to take part in the study. The study was approved by the Medical Ethics Committee of the University Medical Center Groningen (UMCG), in accordance with the 1975 Declaration of Helsinki (as revised in 1983).
: Not applicable.
: The authors declare that they have no competing interests.