1. Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Cir, Baltimore, MD 21250, USA
2. Department of Physics, University of Miami, 1320 Campo Sano Drive, Coral Gables, FL 33124, USA
3. Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
4. Institut d’Astrophysique de Paris, CNRS and Sorbonne Université, UMR 7095, 98 bis Boulevard Arago, 75014 Paris, France
5. Zentrum für Astronomie der Universität Heidelberg, ITA, Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
6. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
7. Center for Astrophysics, Harvard University & Smithsonian, 60 Garden Str., Cambridge, MA 02138, USA
8. Black Hole Initiative, Harvard University, 20 Garden Str., Cambridge, MA 02138, USA
9. Dipartimento di Fisica e Astronomia (DIFA), Università di Bologna, Via Gobetti 93/2, I-40129 Bologna, Italy
10. Department of Physics and Astronomy, Clemson University, of Physics, Clemson, SC 29634, USA
11. INAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Via Piero Gobetti, 93/3, 40129 Bologna, Italy
12. McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
13. Department of Physics & Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
14. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George Str., Toronto, ON M5S 3H8, Canada
15. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA
16. Eureka Scientific, 2452 Delmer Str. Suite 100, Oakland, CA 94602, USA