The role of relaxation in systematic desensitization.
D000328:Adult; D000818:Animals; D001007:Anxiety; D001521:Behavior Therapy; D003213:Conditioning, Psychological; D005108:Extinction, Psychological; D005239:Fear; D005260:Female; D006801:Humans; D010698:Phobic Disorders / Q000628:therapy*; D012063:Relaxation; D012911:Snakes