1. Instituto de Física, Universidad Nacional Autónoma de México, Apdo. Postal 20-364, México
2. Departments of Physics, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15217, USA
3. McWilliams Center for Cosmology, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15217, USA
4. Lawrence Berkeley National Lab, 1 Cyclotron Rd, Berkeley CA 94720, USA
5. Departments of Physics and Astronomy, University of California, Berkeley, CA 94720, USA
6. Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB), Martí i Franquès 1, E-08028 Barcelona, Spain
7. Departamento de Física, Universidad de Córdoba, Campus de Rabanales, Edificio Albert Einstein, E-14071, Córdoba, Spain
8. Center for Cosmology and AstroParticle Physics, The Ohio State University, Columbus, OH 43210, USA
9. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
10. Institute of Cosmology and Gravitation, Dennis Sciama Building, University of Portsmouth, Portsmouth, PO1 3FX, UK
11. Universitäts-Sternwarte München, Ludwig-Maximilians-Universität München, Scheinerstraße 1, D-81679 München, Germany
12. Max-Planck-Institut für extraterrestrische Physik, Postfach,1312, Giessenbachstr., D-85741 Garching, Germany
13. Center for Cosmology and Particle Physics, New York University, New York, NY 10003, USA
14. School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, UK
15. Instituto de Física Teórica, (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, E-28049 Madrid, Spain
16. Leibniz Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
17. Campus of International Excellence UAM+CSIC, Cantoblanco, E-28049 Madrid, Spain
18. Departamento de Física Teórica M8, Universidad Autonóma de Madrid (UAM), Cantoblanco, E-28049, Madrid, Spain
19. Department of Physics and Astronomy, Sejong University, Seoul 143-747, Korea
20. Department of Physics and Astronomy, Ohio University, 251B Clippinger Labs, Athens, OH 45701, USA
21. Department of Physics and Astronomy, University of Utah, 115 S 1400 E, Salt Lake City, UT 84112, USA
22. Department of Chemistry and Physics, King's College, 133 North River St, Wilkes Barre, PA 18711, USA