Search Rules:

Type a keyword or keywords in the search box. Exact phrases should be entered using "double quotation marks".

Searches are case insensitive. Searching for "Apnea" will provide the same matches as the all lowercase "apnea" and uppercase "APNEA".

Including or excluding words:

To make sure that a specific word is always included in a general search topic, place the plus (+) symbol before the key word in the search box. To make sure that a specific word is always excluded from your search topic, place a minus (-) sign before the keyword in the search box.

Example: To find apnea references with obstructive but without central, try "apnea +obstructive -central".

Expand your search using wildcards (*):

By typing an * at the end of a keyword, you can search for the word with multiple endings.

Example: Type polysomno*, to find all references with polysomnograph, polysomnography, and polysomnogram.