Recently published research
This feature presents a personal selection of some significant articles that were listed in Medline from July to September 1999. Readers need to be aware that abstracts written by authors themselves may sometimes give a positive 'slant' to the paper which is not strictly based on the findings. Where authors' addresses are included in the database, we have given them here so that readers who wish for a reprint can request it directly. Alternatively, a number of journals now publish on the world wide web and some articles may be downloaded in pdf versions. Copyright 2000 Harcourt Publishers Ltd.