Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (140928)
Text and Data Mining valid from 2018-04-18
Received: 9 December 2017
Accepted: 29 March 2018
First Online: 18 April 2018
Ethics approval and consent to participate
: The study was approved by the ethics committee of the canton of Bern (KEK number Z007/12) and all participants signed informed consent.
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: The funding source had no involvement in study design, data collection, analysis and interpretation of data, in writing the manuscript and in the decision to submit the manuscript for publication. All authors state no conflict of interest.
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