1. Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK
2. School of Astronomy and Astrophysics, University of Birmingham, Edgbaston, Birmimgham B15 2TT, UK
3. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George Street, Toronto, ON M5S 3H8, Canada
4. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St George Street, Toronto, ON M5S 3H4, Canada
5. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany
6. Instituto de Astrofísica de Canarias, E-38200 La Laguna,Tenerife, Spain
7. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
8. University of Arizona, Tucson, AZ 85719, USA
9. Observatório Nacional, São Cristóvão, Rio de Janeiro, Brazil
10. Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, USA
11. New Mexico State University, Las Cruces, NM 88003, USA
12. Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA
13. Center for Astrophysical Sciences and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
14. Université Côte d’Azur, Observatoire de la Côte d’Azur, Laboratoire Lagrange, CNRS, Blvd de l’Observatoire, F-06304 Nice, France
15. National Optical Astronomy Observatories, Tucson, AZ 85719, USA