Table 3 Stop words defined by PubMed. Stop words were ignored during dictionary matching.

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