[1] Ninewells Hosp, Dundee Teaching Hosp NHS Trust, Dept Clin Pharmacol, Med Monitoring Unit, Dundee DD1 9SY, Scotland
[2] Kings Cross Hosp, Dundee Teaching Hosp NHS Trust, Infect & Immunodeficiency Unit, Dundee DD5 8EA, Scotland
[3] Bradford Business Sch, Dept Mkt, Bradford, W Yorkshire, England