J. Padberg1,2,3, D. Schürmann1,2,3, Martin P. Grobusch1,2,3, Frank Bergmann1,2,3
1Date of receipt: 10 September 1998
2Department of Infectious Diseases, Charité, Campus Virchow-Klinikum, Humboldt University of Berlin, 13353 Berlin, Germany.
3accepted: 15 September 1998.