Douglas, how to convert the former links for downloading review material? Thomas * * * Dr.rer.nat. Dipl.-Ing. Thomas Lehmann Institut für Medizinische Informatik RWTH Aachen D - 52057 Aachen Tel: +49 241 80 88793 Fax: +49 241 80 3388793 Email: lehmann at computer.org Web: http://irma-project.org/lehmann