1. Department of Physics, University of Turin, Turin, Italy
2. Polytechnic University of Turin, Turin, Italy
3. INFN Section of Turin, Turin, Italy
4. Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
5. INFN Section of Rome Tor Vergata, Rome, Italy
6. RIKEN, Wako, Japan
7. Université Paris Cité, CNRS, Astroparticule et Cosmologie, Paris, France
8. KTH Royal Institute of Technology, Stockholm, Sweden
9. Technical University of Munich, Munich, Germany
10. S.P. Korolev Rocket, Space Corporation Energia, Moscow, Russia
11. ASI, Italian Space Agency, Rome, Italy
12. Omega, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
13. Department of Astronomy, Astrophysics, The University of Chicago, Chicago, IL, USA
14. Karlsruhe Institute of Technology, Institute for Astroparticle Physics, Karlsruhe, Germany
15. INFN National Laboratories of Frascati, Frascati, Italy
16. Department of Physics, Konan University, Kobe, Japan
17. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
18. Department of Physics, Colorado School of Mines, Golden, CO, USA
19. National Centre for Nuclear Research, Otwock, Poland
20. Faculty of Physics, University of Warsaw, Warsaw, Poland
21. Stefan Batory Academy of Applied Sciences, Skierniewice, Poland