Columbia subject headings:
Brain--Congresses.
Nervous system--Surgery--Congresses.
Spine--Wounds and injuries--Complications--Congresses.
Tomography--Congresses.
Harvard subject headings:
Brain--Congresses
Brain--Tomography--Congresses.
Nervous system--Surgery--Congresses
Spine--Wounds and injuries--Complications--Congresses.
Princeton subject headings: