1. KU Leuven, Institute of Astronomy, Leuven, Belgium
2. The Australian National University, Canberra, Australia
3. University of Exeter, School of Physics and Astronomy, Exeter, United Kingdom
4. Observatoire de la Côte d’Azur, Nice, France
5. University of Sydney, Sydney Institute for Astronomy, School of Physics, Camperdown, New South Wales, Australia
6. ETH Zurich, Institute for Particle Physics and Astrophysics, Zurich, Switzerland
7. University of Liège, Space Sciences, Technologies & Astrophysics Research (STAR) Institute, Liège, Belgium
8. University of Arizona, Department of Astronomy and Steward Observatory, Tucson, Arizona, United States
9. Universität zu Köln, I. Physikalisches Institut, Cologne, Germany