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Brigitte Stephan has received payments\/honoraria for lectures and presentations and\/or received grants and\/or participated in clinical trials including from the following companies: AbbVie, Almirall Hermal, Amgen, Beiersdorf, Boehringer Ingelheim, Bristol-Myers Squibb, Celgene, Glaxo SmithKline, Janssen-Cilag, LEO Pharma, Lilly, Medac, Novartis, Pierre Fabre, Sanofi Aventis and UCB. Matthias Augustin has received institutional research funding, travel grants and lecture fees from companies which produce products for acne, including Almirall, Beiersdorf, Galderma and GSKx.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of Interest"}},{"value":"The study was conducted according to the principles expressed in the Declaration of Helsinki. We took the criteria of a National Good Practice Guideline into consideration [\n                      \n                      ,\n                      \n                      ]. 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