1. Institute
of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
2. Faculté
des Sciences, Université de Kinshasa, B.P. 202 Kinshasa XI, Democratic Republic of the Congo
3. Federal Institute for Risk Assessment, Max-Dohrn-Straße 8-10, D-10589 Berlin, Germany
4. Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland
5. University of Basel, Petersplatz
1, CH-4003 Basel, Switzerland