Received: 26 September 2018
Accepted: 30 April 2019
First Online: 14 May 2019
: Table removed
: The study was performed in accordance with the principles of the Declaration of Helsinki and was approved by the Medical Ethical Committee of the University Medical Center Groningen (file number 2016/141). All patients gave oral informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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