RT Journal Article SR Electronic T1 Predictive value of asthma medication to identify asthma sufferers. JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 154 OP 155 VO 52 IS 475 A1 Ken Stein A1 Becky Jenkins A1 Harvey Gamble A1 Khaled Aziz YR 2002 UL http://bjgp.org/content/52/475/154.abstract AB