I don't think it is worth mentioning, unless every
time it is mentioned
it
is done in a way to tell readers that this is not only normal, it is
required.
Risker/Anne
The history of this issue has involved manufacturers taking control of
the studies to the extent that unfavorable results were sometimes not
published while favorable results were. Journal editors cracked down on
that, see:
http://www.cmaj.ca/cgi/content/full/165/6/786
Fred