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[PDF] Travel Medicine: Proceedings of the First Conference on International Travel Medicine, Z?rich, Switzerland, 5?8 April 1988 D. J. Bradley (auth.), PD Dr. med. Robert Steffen, Dr. Hans Lobel, Dr. James Haworth, Professor David J. Bradley MA, DM, FRCPath, FFCM, FRCP, FlBiol, Hon. FlPHE (eds.)