KLK4 and hereditary angioedema: Patients are encouraged to carry "alert" identification (wallet card example may be found at: http://www.haecanada.com/files/WalletCard_Bilingual.pdf) and an accompanying letter indicating the diagnosis of HAE (with type), materials necessary to be carried for care for presentation at airline and other security areas, and outlining instructions for administration of intervention therapy (such as infusion of pdC1INH, rhC1INH, bradykinin B2 receptor antagonist, or kallikrein inhibitor).