Received: 31 August 2018
Revised: 25 February 2019
Accepted: 5 March 2019
First Online: 21 March 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Canton of Bern (reference numbers: KEK BE 090_07 and KEK BE 178_03) and all patients involved gave written informed consent. All animal procedures were approved by the Veterinary Department of the Canton of Bern, Switzerland (reference number: BE117/16; 28'384).
: Not applicable.
: The authors declare that they have no competing interests.
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