1. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance, Institute of the Ruhr University Bochum (IPA), Bochum 44789, Germany
2. Department of Thoracic Surgery, University Medicine Essen, Essen 45239, Germany
3. Department of Interventional Pneumology, University Medicine Essen, Essen 45239, Germany
4. Department of Pathology, University Medicine Essen, Essen 45239, Germany