1 1 Department of Nuclear Medicine, Center for Integrated Oncology Cologne Bonn, University Hospital of Cologne, Cologne, Germany ; 2 Department of Nuclear Medicine and Molecular Imaging, University Medical Centre Groningen, Groningen, The Netherlands ; 3 Lung Cancer Group Cologne, Department I of Internal Medicine, Center for Integrated Oncology Cologne Bonn, University Hospital of Cologne, Cologne, Germany ; 4 Institute of Radiochemistry & Experimental Molecular Imaging, University Hospital of Cologne, Cologne, Germany.