Text and Data Mining valid from 2018-06-15
Received: 9 March 2018
Accepted: 6 June 2018
First Online: 15 June 2018
Ethics approval and consent to participate
: The final version was approved by the Ethics Committee of the Technical University of Munich (TUM) with the project number 73/17 S.A preliminary statement on the front of the questionnaire informed the patients about the voluntary and pseudonymous nature of the study as well as its purpose. Respondents were not offered any incentive for study participation.
: The authors declare that they have no competing interests.
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