Columbia subject headings:
Photochemotherapy--Congresses.
Photosensitization, Biological--Congresses.
Porphyrins--Physiological effect--Congresses.
Harvard subject headings:
Photochemotherapy--Congresses.
Photosensitization, Biological--Congresses.
Porphyrins--Physiological effect--Congresses.
Princeton subject headings:
Photochemotherapy--Congresses.
Photosensitization, Biological--Congresses.
Porphyrins--Physiological effect--Congresses.