RT Journal Article SR Electronic T1 Budesonide-formoterol for maintenance and as needed reliever treatment reduced asthma exacerbations JF Archives of disease in childhood - Education & practice edition JO Arch Dis Child Educ Pract Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP ep31 OP ep31 VO 92 IS 1 YR 2007 UL http://ep.bmj.com/content/92/1/ep31.abstract AB