1. INAF – Osservatorio Astronomico di Brera , via Brera 28, I-20121 Milano, Italy
2. INAF – Osservatorio Astronomico di Capodimonte , sal. Moiariello 16, I-80131 Napoli, Italy
3. FINCA, University of Turku , Vesilinnantie 5, FI-20014 Turku, Finland
4. Department of Physics and Astronomy, Botswana International University of Science and Technology , Private Bag 16, Palapye, Plot 10071, Botswana
5. Universita’ degli studi dell’Insubria , via Valleggio 11, I-22100 Como, Italy
6. Physics and Astronomy Department, Tufts University , 574 Boston Ave, Medford, MA 02155, USA
7. INAF – Osservatorio Astronomico di Trieste , via G.B. Tiepolo 11, I-34143 Trieste, Italy
8. Institute of Physics, Laboratory for Galaxy Evolution, Ecole Polytechnique Federale de Lausanne, Observatoire de Sauverny , Chemin Pegasi 51, CH-1290 Versoix, Switzerland
9. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg , Mönchhofstrasse 12 - 14, D-69120 Heidelberg, Germany
10. Sub-Department of Astrophysics, Department of Physics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK