Study selection
A total of 434 studies from six databases were identified through
electronic and manual searches. Nineteen duplicate studies were
excluded, and 371 studies did not pass the title and abstract screening.
From 44 studies eligible for full-text assessment, 36 were excluded due
to deviation from the PICO, of which two papers were excluded due to the
study subjects having concomitant diseases and
allergies.31-32 One study was a duplicate, and the
full-text of one study could not be retrieved despite maximal efforts.
An additional 3 studies were identified through manual search of
relevant articles. Finally, nine studies were included in this SR/NMA
(Figure 1).