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ABOUT MEDLINE
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MEDLINE includes "citations" from nearly 4000 of the world's leading biomedical journals.

A "citation" is made up of the basic pieces of each journal article, which are mounted into fields. Most fields are searchable.

This is what a basic MEDLINE citation looks like. The "fields" are in bold:

Unique Identifier
10685134
Authors
Kuller LH.
Institution
Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pennsylvania, USA.
Title
Hormone replacement therapy and coronary heart disease. A new debate. [Review] [93 refs]
Source
Medical Clinics of North America. 84(1):181-98, ix-x, 2000 Jan.
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MeSH Subject Headings
Clinical Trials
Coronary Disease / et [Etiology]
*Coronary Disease / pc [Prevention & Control]
*Estrogen Replacement Therapy
Female
Human
Myocardial Infarction / et [Etiology]
*Myocardial Infarction / pc [Prevention & Control]
Postmenopause
Risk Factors
Treatment Outcome
Abstract
Hormone replacement therapy is extensively used in the United States, especially for the possible prevention of heart disease, osteoporotic fractures, and, more recently, dementia. The results of recent clinical trials have raised new questions about the risk and benefits of estrogen or estrogen/progesterone therapy to prevent heart attacks, the choice of specific drug therapy such as specialized estrogen receptor modulation (SERM). The change in risk factors, especially weight gain or obesity, may determine the risks and benefits of hormone replacement therapy. [References: 93]