1 Department of Ophthalmology, University Medical Center Rostock, Rostock, Germany; Department of Ophthalmology, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany. Electronic address: friederike.schaub@med.uni-rostock.de.
2 Faculty of Medicine, Institute of Medical Statistics and Computational Biology (IMSB), University of Cologne, Cologne, Germany.