[1] Univ Mannheim, Med Ctr, Chirurg Klin, Mannheim, Germany
[2] Christie Hosp, Dept Clin Oncol, Manchester, Lancs, England
[3] Sankt Hildegardis Hosp, Catholic Clin Ctr, Mainz, Germany
[4] Gen Hosp Hamburg, Dept Lung & Bronchialkunde, Hamburg, Germany
[5] Schillerhohe Hosp Gerlingen, Stuttgart, Germany
[6] St Vincentius Hosp, Med Klin, Karlsruhe, Germany
[7] Thoraxklin, Heidelberg, Germany
[8] German Canc Res Ctr, D-6900 Heidelberg, Germany