1. Department of Viroscience; Erasmus Medical Center; Rotterdam The Netherlands
2. Rotterdam Eye Hospital; Rotterdam The Netherlands
3. Anova Health Institute; Johannesburg and Tzaneen South Africa
4. Department of Ophthalmology; VU University Medical Center; Amsterdam The Netherlands
5. Rotterdam Ophthalmic Institute; Rotterdam The Netherlands
6. School of Public Health & Family Medicine; University of Cape Town; Cape Town South Africa
7. Research Center for Emerging Infections and Zoonoses; University of Veterinary Medicine; Hannover Germany
8. Department of Medical Microbiology; University of Pretoria; Pretoria South Africa