With no explanation, label each line with "other-disease", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
His
clinical
sub-specialties
are
vitreoretinal
surgery
,
retinal
vascular
disease
,
diabetic
retinopathy
and
macular
degeneration
His:O
clinical:O
sub-specialties:O
are:O
vitreoretinal:O
surgery:O
,:O
retinal:other-disease
vascular:other-disease
disease:other-disease
,:O
diabetic:other-disease
retinopathy:other-disease
and:O
macular:O
degeneration:O