Text and Data Mining valid from 2018-03-09
Received: 30 November 2017
Accepted: 26 February 2018
First Online: 9 March 2018
Ethics approval and consent to participate
: Data collection and follow-up questionnaires have been approved by the ethics committee of the Bavarian Medical Association (Bayerische Landesärztekammer) and have been performed in accordance with the Declaration of Helsinki. All study participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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