Funding for this research was provided by:
Robert Bosch Stiftung (NA)
Ministry of Science, Research and Arts, state of Baden-Wuerttemberg (NA)
Text and Data Mining valid from 2019-10-27
Received: 9 August 2019
Accepted: 9 October 2019
First Online: 27 October 2019
Change Date: 5 December 2019
Change Type: Correction
Change Details: Following publication of the original article , the authors reported an error in the author list. The study group has been listed with the authors in the pdf version. The correct presentation of the authors is shown below.
Ethics approval and consent to participate
: All participants provided written informed consent and the Ethics Committee of the University of Ulm had approved the study (application no. 318/08 and 50/12).
: Not applicable.
: The authors declare that they have no competing interests.