title: ABC of allergies. Perennial rhinitis.
authors.affiliation: Royal Brompton Hospital, London.
authors.forename: I S
authors.initials: IS
authors.lastname: Mackay
authors.forename: S R
authors.initials: SR
authors.lastname: Durham
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D012221:Rhinitis, Allergic, Perennial / Q000175:diagnosis / Q000209:etiology / Q000628:therapy