Below widget is available to do a quick lookup in MEDLINE for your PICO question. Please note this is not a replacement for a precision search finding all results for your query, but it will give you a good indication if you are on the right track formulating your PICO.
PICO Example*: Prevention (O) of Whooping Cough (P) in adults (P) using vaccination (I)
* not all PICO elements are required for the search query. In this example, C is not used.