1. Institute of Genetic Epidemiology, Medical University of Innsbruck, Innsbruck, Austria
2. Department of Genetic Epidemiology, University of Regensburg, Regensburg, Germany
3. Department of Ophthalmology, University Hospital Regensburg, Regensburg, Germany
4. Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria