1. Department of Dermatology, Heinrich‐Heine‐University, Moorenstrasse 5, 40225 Duesseldorf, Germany
2. Division of Immunology, Medical Institute of Environmental Hygiene at Heinrich‐Heine‐University, Auf’m Hennekamp 50,
40225 Duesseldorf, Germany
Diagnostic Product Corporation, 5700 West 96th Street, Los Angeles, CA 90045‐5544, U.S.A.