1. Department of Ophthalmology; Sahlgrenska University Hospital; Mölndal Sweden
2. Department of Clinical Neuroscience; Institute of Neuroscience and Physiology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
3. Department of Communicable Disease Control; Region Västra Götaland; Gothenburg Sweden
4. Department of Infectious Diseases; Sahlgrenska University Hospital; Gothenburg Sweden