1. Department of Ophthalmology University of Bonn Bonn Germany
2. Department of Ophthalmology University of Cologne Faculty of Medicine and University Hospital Cologne Cologne Germany
3. Department of Ophthalmology Section for Strabismus and Neuroophthalmology University Medicine Goettingen Goettingen Germany
4. Department of Ophthalmology Justus‐Liebig University Giessen and Universitaetsklinikum Giessen and Marburg GmbH Campus Giessen Giessen Germany
5. Medical practice for ophthalmology Department of Ophthalmology Eye Clinic Dresden Friedrichstadt Dresden Germany
6. Department of Ophthalmology Julius‐Maximilians University Würzburg Würzburg Germany
7. Department Strabism and Oculoplastic Eye‐Clinic‐Esslingen Esslingen Germany
8. Department of ophthalmology University Duisburg Essen Essen Germany
9. Department of Ophthalmology Cantonal Hospital St. Gallen St. Gallen Switzerland
10. University of Zurich Zurich Switzerland
11. Department of Ophthalmology University of Heidelberg Heidelberg Germany
12. Department of Ophthalmology University of Leipzig Leipzig Germany
13. Department of Ophthalmology University of Luebeck Luebeck Germany