The concept of touch.
D000368:Aged; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008960:Models, Psychological; D009633:Nonverbal Communication; D009723:Nurse-Patient Relations; D009732:Nursing Care; D010550:Personal Space; D011247:Pregnancy; D014110:Touch