Text and Data Mining valid from 2018-10-12
Received: 5 August 2018
Accepted: 20 September 2018
First Online: 12 October 2018
Ethics approval and consent to participate
: This study has been approved by the appropriate ethics committee (Ethikkommission der Medizinischen Fakultät Heidelberg, Alte Glockengießerei 11/1, 69,115 Heidelberg: ethics votum Nr. S-091/2009) and has therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki. All persons gave their informed consent prior to their inclusion in the study.
: Not Applicable.
: The authors declare that they have no competing interests.
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