1. Radiation Protection in Aviation, Radiation Biology Department, Institute of Aerospace Medicine; German Aerospace Center; Köln Germany
2. Numerical Sciences Research Team, Protection and Survival Laboratory (mail route AAM-631); FAA Civil Aerospace Medical Institute; Oklahoma City OK USA
3. Biophysics, Radiation Biology Department, Institute of Aerospace Medicine; German Aerospace Center; Köln Germany
4. NASA Langley Research Center; Hampton VA USA