1. Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA, UK
2. Cavendish Laboratory – Astrophysics Group, University of Cambridge , 19 JJ Thomson Avenue, Cambridge CB3 0HE, UK
3. Department of Physics and Astronomy, University College London , Gower Street, London WC1E 6BT, UK
4. INAF – Osservatorio Astrofisico di Arcetri , Largo E. Fermi 5, I-50125 Florence, Italy
5. Department of Physics, Florida International University , 11200 SW 8th Street, Miami, FL 33199, USA
6. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg , Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
7. Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB3 0HA, UK
8. Institute of Astronomy and Astrophysics, Academia Sinica , Taipei 10617, Taiwan
9. Department of Physics and Astronomy, University of Victoria , Finnerty Road, Victoria, BC V8P 1A1, Canada
10. Department of Physics, Tamkang University , No. 151, Yingzhuan Road, Tamsui District, New Taipei City 251301, Taiwan