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1Department of Clinical Pharmacology, St Bartholomew's and The Royal London School of Medicine and Dentistry, Charterhouse Square, London EC1M 6BQ
1The Analytical Unit, Cardiological Sciences St George's Hospital Medical School, London SW17 0RE, UK
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Correspondence: Dr A. Johnston, Department of Clinical Pharmacology, St Bartholomew's and The Royal London School of Medicine and Dentistry, Charterhouse Square, London EC1M 6BQ. Tel: +44–20–7882 3404; Fax: +44–20–7882 3408; E-mail: A.Johnston@mds.qmw.ac.uk