Text and Data Mining valid from 2018-12-01
Received: 20 July 2018
Accepted: 22 November 2018
First Online: 8 December 2018
Ethics approval and consent to participate
: This study was performed in accordance with the declaration of Helsinki. Prior to data collection the study protocol was assessed by the institutional review board of the University Medical Centre Utrecht, The Netherlands and approved with an exemption from requiring ethical approval (14–053/C) because patients were not subjected to any investigational action.
: Not applicable.
: The authors declare that they have no competing interests.
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