Prevention of Experimentally Induced Irritant Contact Dermatitis by Extracts of Isatis tinctoria Compared to Pure Tryptanthrin and its Impact on UVB-Induced Erythema - Heinemann, Christian ; Schliemann-Willers, Sibylle ; Oberthür, Christine ; Hamburger, Matthias ; Elsner, Peter (Planta Medica, 2004)