RT Journal Article SR Electronic T1 How to use toxicology screening tests 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 194 OP 199 DO 10.1136/archdischild-2012-301792 VO 97 IS 5 A1 John R H Archer A1 David M Wood A1 Paul I Dargan YR 2012 UL http://ep.bmj.com/content/97/5/194.abstract AB