1. School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK
2. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
3. Department of Astronomy, University of Virginia, PO Box 400325, Charlottesville, VA 22904-4325, USA
4. National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA 22903, USA
5. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
6. Observatorio Astronómico Nacional (OAN-IGN), Apartado 112, E-28803 Alcalá de Henares, Spain
7. Universidad de Valencia, C/Dr. Moliner 50, E-46100 Burjassot, Spain
8. Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA
9. Department of Physics, Westminster College, 1840 South 1300 East, Salt Lake City, UT 84105, USA
10. Department of Astronomy, The Oskar Klein Centre, Stockholm University, Alba Nova University Centre, SE-106 91 Stockholm, Sweden
11. European Southern Observatory (ESO), Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany
12. International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, Crawley, WA 6009, Australia
13. ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), The University of Western Australia, Crawley WA 6009, Australia
14. Department of Physics, University of Oxford, Oxford OX1 3RH, UK
15. KTH, Department of Physics, the Oskar Klein Centre, AlbaNova, SE-106 91 Stockholm, Sweden
16. School of Physical and Geographical Sciences, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG, UK
17. Department of Astronomy, University of Texas, Austin, TX 78712-0259, USA
18. Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent, Belgium
19. Observational Cosmology Lab, Code 665, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
20. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA
21. Department of Physics and Astronomy, The Johns Hopkins University, 366 Bloomberg Center, 3400 N. Charles Street, Baltimore, MD 21218, USA
22. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China