Columbia subject headings:
Harvard subject headings:
Photochemotherapy--Congresses.
Psoralens--Structure-activity relationships--Congresses.
Psoralens--Therapeutic use--Testing--Congresses.
Psoralens--Toxicology--Congresses.
Princeton subject headings:
Photochemotherapy--Congresses.
Psoriasis--Chemotherapy--Congresses.
Psoriasis--Radiotherapy--Congresses.
Skin--Effect of radiation on--Congresses.
Ultraviolet radiation--Physiological effect--Congresses.
Ultraviolet radiation--Therapeutic use--Congresses.