The CINAHL database (Cumulative Index to Nursing and Allied Health) covers nursing, allied health, biomedical and consumer health journals, publications of the American Nursing Association, and the National League for Nursing.
It's also a great database to find articles written by nurses.
Healthcare professionals sometimes use the PICO or PICOT format to develop keywords for searching of clinical questions where:
P - Patient or Population
I - Intervention
C - Comparison
O - Outcome
T - Time (sometimes included)
For more information about forming and using a PICO question to search, please see the American Journal of Nursing article below.
MEDLINE/PubMed allows you to search using the PICO Framework:
Trip is a clinical search engine designed to allow users to quickly and easily find and use high-quality research evidence to support their practice and/or care.
To use the PICO search feature, click on "PICO Search" on the Trip database website.