With no explanation, label each line with "O", "other-medical", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Ketamine
infusions
are
used
for
the
acute
pain
treatment
in
emergency
departments
and
in
the
perioperative
period
in
individuals
with
refractory
pain
.
Ketamine:other-medical
infusions:O
are:O
used:O
for:O
the:O
acute:O
pain:O
treatment:O
in:O
emergency:O
departments:O
and:O
in:O
the:O
perioperative:O
period:O
in:O
individuals:O
with:O
refractory:O
pain:O
.:O