1Department of Plastic, Reconstructive, Aesthetic and Hand Surgery, University Hospital OWL, Campus Klinikum Bielefeld Center, Bielefeld, Germany
2Department of Dermatology, Venereology and Allergology, Ruhr-University Bochum, Bochum, Germany
3Department for Statistical Consulting and Analysis, Center for Higher Education, Technical University of Dortmund, Dortmund, Germany
4Department of Plastic, Reconstructive and Aesthetic Surgery, St. Josef Hospital, Essen, Germany
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