1. Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
2. Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA
3. Center for Cosmology and Particle Physics, New York University, New York, NY 10003, USA
4. Department of Astronomy, University of Maryland, College Park, MD 20742, USA
5. SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584CA Utrecht, the Netherlands
6. Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500GL Nijmegen, the Netherlands
7. Center for Cosmology and Astro-Particle Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA
8. Department of Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA
9. Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
10. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
11. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain
12. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain