Affiliation: | aShell International Ltd., P.O. Box 662, London, SE1 7NE, UK;bBP International Ltd., PAT Department, (Bld 200, 1st Floor), Chertsey Road, Sunbury-on-Thames, TW16 7LN, UK;cGlaxoSmithKline, Information Analysis, New Frontiers Science Park, Coldharbour Road, Harlow, CM19 5AW, UK;dAstraZeneca R&D Charnwood, Discovery Information, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, UK |