Title from PDF title page (viewed on May 1, 2012).
"Institute of General Practice & Primary Care, The University of Sheffield, School of Health and Related Research."
"April 2007."
Study to determine the relationship between blood-heroin/methadone and concomitant drug levels in fatal opioid poisonings by Phillip Oliver. Published by NHS National Treatment Agency for Substance Misuse in 2007. Publication and catalogue information, links to buy online and reader comments.