1. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
2. Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia
3. ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
4. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
5. Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
6. Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands
7. Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
8. Center for Cosmology and AstroParticle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA
9. Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn, Germany
10. Max-Planck-Institut für extraterrestrische Physik, Postfach 1312 Giessenbachstrasse, D-85741 Garching, Germany
11. Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK
12. Kapteyn Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, the Netherlands