de Kleijn, B. J. http://orcid.org/0000-0001-9526-6888
Wedman, J. http://orcid.org/0000-0001-6448-134X
Zijlstra, J. G.
Dikkers, F. G.
van der Laan, B. F. A. M. http://orcid.org/0000-0002-5016-2871
Article History
Received: 13 November 2018
Accepted: 15 March 2019
First Online: 2 April 2019
Compliance with ethical standards
:
: None of the authors have conflicts of interest to declare.
: The study was approved by the Medical Ethical Committee of the University Medical Center Groningen (M13.142044). No patient consent was needed in this retrospective study, in accordance with the Helsinki declaration.