1. Chairman, Wolfson Institute of Preventive Medicine, Barts and The London Queen Mary's School of Medicine and Dentistry, Charterhouse Square, London EC1 M 6BQ, UK
2. Rapporteur, Division of Medical Screening, Department of Pathology, Women and Infants Hospital, Providence, RI, USA
3. Liverpool Women's Hospital, Crown Street, Liverpool L8 7SS, UK
4. Institute of Child Health, Centre for Paediatric Epidemiology and Biostatistics, 30 Guildford Street, London WC1N IEH, UK
5. Department of Child Health, St George's Hospital Medical School, London SW17 0RE, UK
6. Centre for Infections, Health Protection Agency, 61 Colindale Avenue, London NW9 5HT, UK
7. Dept of Medical Microbiology, Grampian University Hospitals Trust, Foresterhill, Aberdeen AB25 2ZN, UK
8. Centers for Disease Control (CDC), Atlanta, GA, USA