Columbia subject headings:
Cancer--Photochemotherapy--Congresses.
Photosensitizing compounds--Congresses.
Photosensitizing compounds--Therapeutic use--Testing--Congresses.
Harvard subject headings:
Cancer--Photochemotherapy--Congresses
Photosensitizing compounds--Congresses.
Photosensitizing compounds--Therapeutic use--Testing--Congresses.
Princeton subject headings: