1. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlářská 2, CZ -611 37, Czech Republic
2. Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V. (BAV), 12169 Berlin, Germany
3. American Association of Variable Star Observers (AAVSO), Cambridge, MA 02138, USA
4. Astronomical Institute, University of Wrocław, 51-622 Wrocław, Poland
5. Laboratório Nacional de Astrofísica LNA/MCTIC, 37504-364 Itajubá, Brazil
6. Leibniz-Institut für Astrophysik Potsdam (AIP), 14482 Potsdam, Germany
7. Centro de Tecnología Disruptiva, Universidad de San Pablo Tucumán, San Pablo, Tucumán, Argentina
8. Astronomical Institute, Czech Academy of Science, Czech Republic
9. Astronomical Institute of the Slovak Academy of Science, Tatranská Lomnica, Slovakia
10. ELTE Gothard Astrophysical Observatory, 9700 Szombathely, Szent Imre h. u. 112, Hungary
11. Institute Astronomical Observatory, Faculty of Physics, Adam Mickiewicz University, 60-286 Poznań, Poland
12. Astronomical Observatory University of Warsaw, 00-478 Warsaw, Poland