1. European Southern Observatory, Karl Schwarzschild Straße 2, Garching D-85748, Germany
2. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3. Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK
4. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA
5. Armagh Observatory, College Hill, Armagh BT61 9DG, UK
6. Department of Physics & Astronomy, University of Western Ontario, London, Ontario, N6A 3K7, Canada
7. Instituto de Física y Astronomía, Universidad de Valparaíso, 2360102 Valparaiso, Chile
8. Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35405, USA
9. Department of Physics, Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand
10. Vereniging Voor Sterrenkunde (VVS), Oude Bleken 12, B-2400 Mol, Belgium
11. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne (BAV), Munsterdamm 90, D-12169 Berlin, Germany
12. American Association of Variable Star Observers, Cambridge, MA 02138, USA
13. CBA Kleinkaroo, Calitzdorp, South Africa
14. British Astronomical Association, Variable Star Section, Burlington House, Piccadilly, London W1J ODU, UK
15. Astronomy & Astrophysics, Villanova University, Villanova, PA 19085, USA
16. Rowland Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
17. Department of Astronomy, University of Washington, Seattle, WA 98195-1580, USA
18. INAF – Osservatorio Astronomico di Capodimonte, Napoli, I-80131, Italy
19. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK
20. Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, Spain
21. School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UK