A flow chart depicts the search results and article flow for this review. A box at the top of the chart reads:
An arrow drops down from this box to a box tabled “Total articles reviewed (n = 288).”
To the left of this box is another box labeled “Articles reviewed from outside sources (e.g., experts, reference lists) (n = 44).” This box is connected to the “total articles” box by an arrow pointing to the right.
Another right-pointing arrow proceeds to the right from the “total articles” box to a large box that lists the reasons for which articles were excluded, as follows:
Excluded:
A vertical arrow points downward from the “total articles” box and forks into 5 downward-pointing arrows, each ending in a box that lists the number of articles included for each of the key questions, as follows:
Note: USPSTF = U.S. Preventive Services Task Force.
a Six of these articles are also included in the results from key question 3.