1. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic
2. SRON Netherlands Institute for Space Research, Sorbonnelaan 2, NL-3584 CA Utrecht, the Netherlands
3. Anton Pannekoek Institute, University of Amsterdam, Postbus 94249, NL-1090 GE Amsterdam, the Netherlands
4. School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
5. MTA-Eötvös Loránd University Lendület Hot Universe Research Group, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
6. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
7. ICRAR, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
8. INAF – Osservatorio di Astrofisica e Scienza dello Spazio, via P. Gobetti 93/3, I-40129 Bologna, Italy
9. Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544-1001, USA
10. MTA-ELTE Astrophysics Research Group, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
11. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305-4085, USA
12. Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305-4060, USA
13. Physics and Astronomy Department, Michigan State University, East Lansing, MI 48824-2320, USA