title: Response.
authors.affiliation: Centre for Experimental Medicine, Queen's University Belfast, Belfast, Northern Ireland. Electronic address: k.oneill@qub.ac.uk.
authors.forename: Katherine
authors.initials: K
authors.lastname: O'Neill
authors.affiliation: Centre for Experimental Medicine, Queen's University Belfast, Belfast, Northern Ireland.
authors.forename: J Stuart
authors.initials: JS
authors.lastname: Elborn
authors.affiliation: School of Pharmacy, Queen's University Belfast, Belfast, Northern Ireland.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Tunney
authors.affiliation: Clinical Research Facility, Queen's University Belfast, Belfast, Northern Ireland.
authors.forename: Judy M
authors.initials: JM
authors.lastname: Bradley