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| | 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. |
| Previous Definitions: | nasoscope, nasoscopy, National Cancer Institute, National Center for Complementary and Alternative Medicine, National Institutes of Health | | Next Definitions: | natural killer cell, naturopathy, nausea, NB1011, NBI-3001 |
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