Funding for this research was provided by:
Gottfried und Julia Bangerter-Rhyner-Stiftung (NA)
Schweizerische Akademie der Medizinischen Wissenschaften (NA)
Freiwillige Akademische Gesellschaft (NA)
Lungenliga Schweiz (NA)
Boehringer Ingelheim Schweiz (NA)
AstraZeneca Schweiz (NA)
Mundipharma Schweiz (NA)
Received: 16 August 2018
Accepted: 12 November 2018
First Online: 3 December 2018
Ethics approval and consent to participate
: The study was approved by the Ethics Committee northwest/central Switzerland (EK- 269/13). Written informed consent was obtained from all participants prior to study entry.
: Not applicable.
: The authors declare that they have no competing interests.
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