Funding for this research was provided by:
Gottfried und Julia Bangerter-Rhyner-Stiftung
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
internal scientific funds Cantonal Hospital of Aarau
Thermos Fischer Scientific
Received: 26 August 2016
Accepted: 29 January 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: The Institutional Review Board of the Canton of Aargau approved the study and waived the need for informed consent (EK 2012/059) as this was an observational quality control study.
: Not applicable.
: Drs Schutz and Mueller received support from Thermos Fischer Scientific. All other authors declare that they have no competing interests.
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