1. Department of Thoracic Surgery, University Medicine Essen—Ruhrlandklinik, University of Duisburg-Essen, Essen, Germany
2. Department of Dermatology, University Hospital, University of Duisburg-Essen, Essen, Germany
3. Department of Thoracic Surgery, Medical University of Vienna, Vienna, Austria
4. Department of Pathology, University Hospital, University of Duisburg-Essen, Essen, Germany