1 Competence Center for Ocular GVHD, Clinic I of Internal Medicine and Department of Ophthalmology, University of Cologne, Cologne, Germany. leonie.menghesha@uk-koeln.de.
2 Department of Ophthalmology, St. Elisabeth Hospital Hohenlind, Cologne, Germany.
3 Clinic I of Internal Medicine, Center of Integrated Oncology Köln Bonn, University of Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.
4 Competence Center for Ocular GVHD, Clinic I of Internal Medicine and Department of Ophthalmology, University of Cologne, Cologne, Germany.