1. Lawrence Berkeley National Laboratory , 1 Cyclotron Road , Berkeley, CA 94720, USA
2. University of California , Berkeley , 110 Sproul Hall #5800 , Berkeley, CA 94720, USA
3. Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology , Campus UAB, 08193 Bellaterra, Barcelona, Spain
4. Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue , Columbus, OH 43210, USA
5. Department of Physics, The Ohio State University , 191 West Woodruff Avenue , Columbus, OH 43210, USA
6. The Ohio State University , 281 W Lane Ave, Columbus, OH 43210, USA
7. Department of Physics and Astronomy, University College London , Gower Street , London, WC1E 6BT, UK
8. Instituto de Física, Universidad Nacional Autónoma de México , Sendero Bicipuma, C.U., Coyoacán, 04510, Ciudad de México, CDMX, México
9. Center for Astrophysics | Harvard & Smithsonian , 60 Garden Street , Cambridge, MA 02138, USA
10. Departamento de Física, Universidad de los Andes , Cra. 1 No. 18A-10 , Edificio Ip, CP 111711, Bogotá, Colombia
11. Department of Physics, Southern Methodist University , 3215 Daniel Avenue , Dallas, TX 75275, USA
12. Institució Catalana de Recerca i Estudis Avançats , Passeig de Lluís Companys 23, 08010 Barcelona, Spain
13. National Astronomical Observatories, Chinese Academy of Sciences , A20 Datun Rd , Chaoyang District, Beijing 100012, China
14. Department of Physics and Astronomy, University of Waterloo , 200 University Ave W , Waterloo, ON N2L 3G1, Canada
15. Perimeter Institute for Theoretical Physics , 31 Caroline St. North , Waterloo, ON N2L 2Y5, Canada
16. Waterloo Centre for Astrophysics, University of Waterloo , 200 University Ave W , Waterloo, ON N2L 3G1, Canada
17. Department of Physics and Astronomy, Sejong University , Seoul, 143-747, Korea
18. University of Michigan , 500 S State St, Ann Arbor, MI 48109, USA