1. INAF – Astronomical Observatory of Trieste, via G.B. Tiepolo 11, I-34143 Trieste, Italy
2. IFPU – Institute for Fundamental Physics of the Universe, via Beirut 2, I-34151 Trieste, Italy
3. DARK, Niels Bohr Institute, University of Copenhagen, Lyngbyvej 2, DK-2100 Copenhagen, Denmark
4. Tianjin Astrophysics Center, Tianjin Normal University, Binshuixidao 393, 300384 Tianjin, China
5. Astronomy Sector, Department of Physics, University of Trieste, via Tiepolo 11, I-34143 Trieste, Italy
6. INAF – Astronomical Observatory of Rome, via Frascati 33, I-00078 Monteporzio, Italy
7. Department of Physics and Astronomy, University of Southampton, Highfield SO17 1BJ, UK