Received: 16 February 2018
Accepted: 31 May 2018
First Online: 14 June 2018
: The animal protocol of the study was approved by the local committee for animal care (LANUV, Recklinghausen, Germany; protocol no. 84–02.04.2015) and was in accordance with the National Institutes of Health guidelines for the use of live animals (NIH publication No. 85–23, revised 1996).
: The authors declare that they have no competing interests.
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