1. Institute of Animal Welfare, Animal Behaviour and Laboratory Animal Science, Freie Universität Berlin, 14163 Berlin, Germany
2. Department of Biosystems Engineering, Albrecht Daniel Thaer Institute for Agriculture, Humboldt University of Berlin, 10117 Berlin, Germany
3. BITSz Electronics GmbH, 08060 Zwickau, Germany
4. Nuvisan ICB GmbH, 13353 Berlin, Germany