Table 3.

Stop words defined by PubMed. Stop words were ignored during dictionary matching.

a	did	it	perhaps	these
about	do	its	quite	they
again	does	itself	rather	this
all	done	just	really	those
almost	due	kg	regarding	through
also	during	km	seem	thus
although	each	made	seen	to
always	either	mainly	several	upon
among	enough	make	should	use
an	especially	may	show	used
and	etc	mg	showed	using
another	for	might	shown	various
any	found	ml	shows	very
are	from	mm	significantly	was
as	further	most	since	we
at	had	mostly	so	were
be	has	must	some	what
because	have	nearly	such	when
been	having	neither	than	which
before	here	no	that	while
being	how	nor	the	with
between	however	obtained	their	within
both	i	of	theirs	without
but	if	often	them	would
by	in	on	then
can	into	our	there
could	is	overall	therefore