Kinetics and dose-response of photosensitivity in cream psoralen plus ultraviolet A photochemotherapy: comparative in vivo studies after topical application of three standard preparations. - Grundmann-Kollmann,M.; Tegeder,I.; Ochsendorf,F.R.; Zollner,T.M.; Ludwig,R.; Kaufmann,R.; Podda,M. (Br J Dermatol, 2001)