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MeSH Tree

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Combining (AND, OR)

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Let's revisit our search question:

What are the risks of heart diseases in postmenopausal women receiving estrogen replacement therapy?

As you recall, our search combines the MeSH terms:
"*estrogen replacement therapy" AND "exp *heart diseases".

The concepts of "postmenopausal" and "female/women" may be assumed concepts that we do not necessarily need to include in our search strategy. Estrogen replacement therapy is commonly received by postmenopausal women. Other groups -- men, children, teenage girls, etc. -- may rarely or never receive estrogen replacement therapy. Therefore, we do not need to include "postmenopausal women" in our search.