1. Semmelweis University, Budapest, Hungary.
2. Private Practice, Munster, Germany.
3. University Alcalá, Madrid, Spain.
4. University Brescia, Brescia, Italy.
5. Comenius University Medical School, Bratislava, Slovakia.
6. University Eye Clinic, Vojvodina, Serbia.
7. Wroclaw Medical University, Wroclaw, Poland.
8. AHEPA Hospital, Thessaloniki, Greece.
9. Nicolaus Copernicus University, Bydgoszcz, Poland.
10. University Hospital Alexandroupolis, Alexandroupolis, Greece.
11. Kaunas University Eye Clinic, Kaunas, Lithuania.
12. PRN Pharmaceutical Research Network, LLC, Cheyenne, Wyoming.