Abstract
In this issue we launch a new section called ‘Cohort Profile’. We plan to profile a cohort study in each issue, providing information on how and why the cohort was set-up, how it has developed and its major outcomes. Cohort studies provide the foundations of epidemiology and we hope that this new section will provide valuable information for readers, irrespective of how well they feel they know the particular cohort being profiled. For example, many readers may not be aware that the initial hypothesis for setting up the British Regional Heart Study (see pages 1185–92) was to determine the effect of water softness on cardiovascular disease risk. We request contributors to be open and honest in their experience of running a cohort study and therefore hope that readers will learn from past experience. The profiles provide details of how to access the cohort data or collaborate with those who run the study and we hope that these profiles will stimulate valuable collaborative work. The success of the section very much depends upon our acquisition of profiles of cohort studies from across the world. Details of how to submit a cohort profile are provided in the ‘Cohort Profile’ section and these details will be published with future profiles.

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