1. Department of Tissue Engineering & Textile Implants, Applied Medical Engineering, University Hospital Aachen, Aachen, Germany.
2. Medizinische Klinik I and Pneumology, University Hospital Aachen, Aachen, Germany.
3. School of Medicine & Medical Science, Health Sciences Centre, University College Dublin, Dublin, Ireland.
4. Department of Pathology, University Hospital Aachen, Aachen, Germany.