Refer to the previous excerpt from Paper A (Section 9.1.4) that described the initial selection…

Refer
to the previous excerpt from Paper A (Section 9.1.4) that described the initial
selection criteria and data extraction.

1.
What
reasons did the authors give for only including published studies in their
review?

2.
Do you
think that these reasons were sufficient justification for excluding
unpublished studies from their review?

How
were poor-quality studies defined?