1. Department of Ophthalmology, University Medical Center, Johannes Gutenberg University Mainz, Mainz, Germany
2. Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
3. Molecular Signaling Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDKD), National Institutes of Health (NIH), Bethesda, Maryland