Contact urticaria: Frequency, elicitors and cofactors in three cohorts (Information Network of Departments of Dermatology; Network of Anaphylaxis; and Department of Dermatology, University Hospital Erlangen, Germany)

Helene Süß, Sabine Dölle‐Bierke, Johannes Geier, Burkhard Kreft, Eva Oppel, Claudia Pföhler, Christoph Skudlik, Margitta Worm, Vera Mahler