Journal article
ASSOCIATION BETWEEN AVAILABILITY OF NONPRESCRIPTION BETA(2) AGONIST INHALERS AND UNDERTREATMENT OF ASTHMA
P GIBSON, D HENRY, L FRANCIS, D CRUICKSHANK, F DUPEN, N HIGGINBOTHAM, R HENRY, D SUTHERLAND
The BMJ | BRITISH MED JOURNAL PUBL GROUP | Published : 1993