The effect of person--an authentic biological force.
Wolf
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D000818:Animals; D001143:Arousal / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology; D005744:Gastric Acid / Q000378:metabolism; D006801:Humans; D007206:Individuality; D007398:Interpersonal Relations; D010817:Physician-Patient Relations; D011603:Psychophysiology