[1] Univ Duisburg Essen, Dept Nucl Med, Hufelandstr 55, D-45122 Essen, Germany
[2] German Canc Consortium DKTQ Univ Hosp Essen, Dept Nucl Med, Essen, Germany
[3] Univ Hosp Essen, Dept Diagnost & Intervent Radiol, Essen, Germany
[4] Univ Duisburg Essen, Univ Med Essen Ruhrlandklin, West German Canc Ctr, Dept Thorac Surg, Essen, Germany
[5] Univ Duisburg Essen, Univ Hosp Essen, West German Canc Ctr WTZ, Dept Med Oncol, Essen, Germany