1. Department of Bioengineering, Imperial College London, London, UK
2. Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe, Germany
3. Laboratory for Applications of Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
4. Department of Behavioural Physiology and Sociobiology, University of Würzburg, Würzburg, Germany