Research Article ABC of one to seven. Bronchial asthma. BMJ 1993; 306 doi: https://doi.org/10.1136/bmj.306.6893.1676 (Published 19 June 1993) Cite this as: BMJ 1993;306:1676 Article Related content Metrics Responses Peer review This article has a correction. Please see:Correction: ABC of one to seven: Bronchial asthma - July 24, 1993 This is a PDF-only article. The first page of the PDF of this article appears below.