Brand, Cristin
Zitzmann, Michael
Eter, Nicole
Kliesch, Sabine
Wistuba, Joachim
Alnawaiseh, Maged
Heiduschka, Peter
Article History
Received: 9 June 2017
Accepted: 25 September 2017
First Online: 13 October 2017
Competing Interests
: JW and MZ received public grants to conduct this study (German Research Foundation and Medical Faculty at Muenster University). The funders of the study had no role in the study design, data collection, data analysis or interpretation, writing of the report, or decision to submit the results for publication. The remaining authors have nothing to disclose.