Funding for this research was provided by:
Gottfried und Julia Bangerter-Rhyner-Stiftung (8472 HEG-DSV)
Text and Data Mining valid from 2019-05-14
Received: 28 January 2019
Accepted: 29 April 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the Canton of Zurich (reference KEK-ZH-number 2014–0595). Written informed consent for the telephone interview was provided at entry into the original cluster-randomized trial.
: Not applicable.
: The authors declare that they have no competing interests.
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