1. SmithKline Beecham; New Frontiers Science Park (South) Third Avenue Harlow Essex UK CM19 5AW
2. University of Oxford; Centre for Statistics in Medicine; Wolfson College Linton Road Oxford UK OX2 6UD
3. Hospital Universitario La Paz-Cantoblanco; Geriatric Department; Ctra de Colmenar km 14,500 Madrid Spain 28049
4. University of Oxford; Clinical Trial Service Unit and Epidemiological Studies Unit; Richard Doll Building, Old Road Campus Roosevelt Drive Oxford UK OX3 7LF
5. Oxford UK