Funding for this research was provided by:
German Research Foundation (SCHO 1545/3-1)
Article History
Received: 22 February 2018
Accepted: 7 June 2018
First Online: 20 June 2018
Ethics approval and consent to participate
: The ESTHER study was approved by the ethics committees of the University of Heidelberg and the state medical board of Saarland, Germany. Written informed consent was obtained from all participants.
: The authors declare that they have no competing interests.
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