Recommendations for photopatch testing by the Photopatch Test Working Group of the German Contact Dermatitis Research Group (DKG). (5th November 2018) - Geier, Johannes; Bauer, Andrea; Becker, Detlef; Brehler, Randolf; Breit, Reinhard; Dickel, Heinrich; Hofmann, Silke; Kapp, Alexander; Lehmann, Percy; Mahler, Vera; Molin, Sonja