
In medicine, a natural history study is a study that follows a group of people over time who have, or are at risk of developing, a specific medical condition or disease. A natural history study collects health information over time in order to understand how the medical condition or disease develops and to give insight into how it might be treated...
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http://en.wikipedia.org/wiki/Natural_history_study

A study that follows a group of people over time who have, or are at risk of developing, a specific medical condition or disease. A natural history study collects health information in order to understand how the medical condition or disease develops and how to treat it.
Found on
http://www.cancer.gov/dictionary?expand=N

a study of the natural development of a disease over time.
Found on
http://www.encyclo.co.uk/local/22225

A prospective follow-up study designed to yield information on the natural course of a disease or condition. Such studies generally focus on the control-treated group in a clinical trial (especially one in which the control treatment is a placebo or standard medical care).
Found on
http://www.virology.net/ATVGlossary.html
No exact match found.