1. Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstraße 14, UZA II, 1090 Vienna, Austria
2. Sight and Life Foundation, PO Box 2116, CH-4002 Basel, Switzerland
3. Johns Hopkins Bloomberg School of Public Health, Department of International Health, Baltimore, Maryland, United States
4. Leibniz-Institute for Food Systems Biology and Research Department Nutrition and Food Sciences at the TUM School of Life Sciences Weihenstephan, Technical University of Munich, Lise-Meitner Straße 34, D-85354 Freising, Germany