1. HPL (Ltd) Medical Laboratories, Istrijská 20, 841 07, Bratislava, Slovak Republic
2. Department of Ophthalmology, Faculty Hospital Nitra, Špitálska 6, 950 01, Nitra, Slovak Republic
3. Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3, 040 01, Košice, Slovak Republic