Gruppen, Eke G.
Kersten, Sander
Dullaart, Robin P. F.
Article History
Received: 20 December 2017
Accepted: 21 March 2018
First Online: 27 March 2018
Ethics approval and consent to participate
: The study protocol was approved by the medical ethics committee of the University Medical Center Groningen, and written informed consent had been obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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