Received: 22 June 2017
Accepted: 20 April 2018
First Online: 8 May 2018
Ethics approval and consent to participate
: As only retrospective analyses of routinely collected, pseudonymised data were performed, and no patient data were involved, the study was regarded as exempt from formal ethical approval according to the regulation of the ethics committee (‘Kantonale Ethikkommission’) associated with the Medical Faculty of the University of Bern. Special measures were undertaken to guarantee the anonymity of the participants.
: The authors declare that they have no competing interests.
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