About the Authors

Christian Kromer

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft

Affiliations Department of Dermatology, University Medical Center Göttingen, Göttingen University, Göttingen, Germany, Mannheim Institute of Public Health, Social and Preventive Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany

Daniel Celis

Roles Data curation, Formal analysis, Investigation, Methodology, Validation, Writing – review & editing

Affiliation Faculty of Economic Sciences, Göttingen University, Göttingen, Germany

Diana Sonntag

Roles Conceptualization, Investigation, Methodology, Project administration, Resources, Software, Supervision, Writing – review & editing

‡ These authors share senior authorship on this work.

Affiliations Mannheim Institute of Public Health, Social and Preventive Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany, Department of Health Science, University of York, Heslington, York, United Kingdom

Wiebke K. Peitsch

Roles Conceptualization, Investigation, Methodology, Project administration, Resources, Supervision, Writing – review & editing

wiebke.ludwig-peitsch@vivantes.de

‡ These authors share senior authorship on this work.

Affiliation Department of Dermatology and Phlebology, Vivantes Klinikum im Friedrichshain, Berlin, Germany

Competing Interests

Dr. Kromer obtained honoraria from Janssen-Cilag. Prof. Ludwig-Peitsch served as investigator for Abbvie, Boehringer-Ingelheim, Eli Lilly, Janssen-Cilag, Merck, Novartis, Pfizer and UCB Pharma; was member of an advisory board of Abbvie, Eli Lilly, LEO Pharma, MSD and Novartis; obtained honoraria from ALK-Abello, Abbvie, Janssen-Cilag, MSD, Novartis and Roche; and received support for conferences from Abbvie, Actelion, ALK-Abello, Allergika, Alma Lasers, ARC Lasers, Asclepion, Beiersdorf, BMS, Celgene, Dermapharm, Dermasence, Eli Lilly, Galderma, GSK, IGEA, Interlac, Janssen-Cilag, L’Oreal, La Roche Posay, LEO Pharma, Medac, Merck, MSD, Novartis, Pierre Fabre, P&M Cosmetics, Pfizer, Roche and Stiefel. Mr. Celis and Dr. Sonntag have no conflict of interest to declare. The review presented here was not supported by pharmaceutical companies. The competing interests do not alter our adherence to PLOS ONE policies on sharing data and materials.