- Correspondence to: Dr Susanne Wedner, c/o Eloise Turner, Infectious Diseases and Epidemiology Unit, London School of Hygiene and Tropical Medicine, Keppel Street, London WC 1E 7HT, UK;
- Accepted 11 March 2002
- Published online 1 November 2002.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.