Funding for this research was provided by:
Robert Pfleger Foundation
Heinrich Sauer and Josef Schmidt Foundation
Received: 21 August 2017
Accepted: 12 January 2018
First Online: 13 February 2018
Ethics approval and consent to participate
: The protocol for the animal feeding study and tissue collection was approved by the local authorities for animal welfare (Regierungspraesidium Darmstadt, approval no. FU_K_5003). All experiments were carried out according to the European Communities Council Directive (86/609/EEC) by individuals with appropriate training.
: Not applicable.
: The authors declare that they have no competing interests.
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