[1] Univ Calif Santa Cruz, Dept Phys & Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA
[2] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, POB 2450, Stanford, CA 94305 USA
[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
[4] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
[5] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[6] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[7] Natl Optic Astron Observ, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile
[8] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
[9] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa
[10] Fermilab Natl Accelerator Lab, PO 500, Batavia, IL 60510 USA
[11] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
[12] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England
[13] Inst Astrophys Paris, CNRS, UMR 7095, F-75014 Paris, France
[14] UPMC Univ Paris 06, Sorbonne Univ, UMR 7095, Inst Astrophys Paris, F-75014 F- Paris, France
[15] Lab Interinst E Astron LlneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil
[16] Observ Nacl, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil
[17] Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA
[18] Natl Ctr Supercomp Applicat, 1205 West Clark St, Urbana, IL 61801 USA
[19] IEEC CSIC, Inst Ciencies Espai, Campus UAB,Carrer Can Magrans,S-N, E-08193 Barcelona, Spain
[20] Barcelona Inst Sci & Technol, IFAE, Campus UAB, E-08193 Barcelona, Spain
[21] Ludwig Maximilians Univ Munchen, Fac Phys, Scheinerstr 1, D-81679 Munich, Germany
[22] Excellence Cluster Univ, Boltzmannstr 2, D-85748 Garching, Germany
[23] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
[24] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[25] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA
[26] Univ Calif Berkeley, Dept Astron, 501 Campbell Hall, Berkeley, CA 94720 USA
[27] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA
[28] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[29] Australian Astron Observ, N Ryde, NSW 2113, Australia
[30] Univ Sao Paulo, Dept Fis Matemat, Inst Fis, CP 66318, BR-05314970 Sao Paulo, SP, Brazil
[31] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA
[32] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
[33] Princeton Univ, Dept Astrophys Sci, Peyton Hall, Princeton, NJ 08544 USA
[34] Inst Catalana Recerca & Estudis Avancats, E-08010 Barcelona, Spain
[35] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany
[36] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[37] Univ Sussex, Dept Phys & Astron, Pevensey Bldg, Brighton BN1 9QH, E Sussex, England
[38] Ctr Invest Energet Medioambientales & Tecnol CIEM, E-28040 Madrid, Spain
[39] Univ Fed Rio Grande do Sul, Inst Fis, Caixa Postal 15051, BR-91501970 Porto Alegre, RS, Brazil
[40] Univ Estadual Paulista, ICTP South Amer Inst Fundamental Res, Inst Fis Teor, Sao Paulo, Brazil
[41] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[42] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England