The role of relaxation in systematic desensitization.
D000818:Animals; D001007:Anxiety; D001521:Behavior Therapy; D005260:Female; D006801:Humans; D009119:Muscle Contraction; D010698:Phobic Disorders / Q000628:therapy*; D011336:Probability; D011581:Psychological Tests; D012054:Reinforcement, Psychology; D012063:Relaxation; D012911:Snakes