The following text search functions are supported:
- Quotation marks ("<phrase>"), e.g. "cystic fibrosis"
- Wildcards (*, ?), e.g. anxi*
- Boolean operators (AND, OR), e.g. hepatitis AND drug
- Required terms (+<term>), e.g. vitamin +d
- Prohibited terms (-<term>), e.g. cancer -bowel
- Field assertions (title:<term>, comment:<term>), e.g. title:"prostate cancer"
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