1. Department of Epidemiology and Preventive Medicine University of Regensburg Germany
2. Chair of Epidemiology LMU München UNIKA‐T Augsburg Augsburg Germany
3. Independent Research Group Clinical Epidemiology Helmholtz Zentrum München German Research Center for Environmental Health Munich Germany
4. University Hospital Münster Münster Germany
5. Department of Dermatology, Allergology and Venereology University Hospital Schleswig‐Holstein Kiel Germany