Physician support personnel in the 1970's. The R and D approach to health manpower.
D004506:Education, Nursing; D006281:Health Occupations / Q000193:education; D006280:Health Workforce; D006801:Humans; D010820:Physicians / Q000600:supply & distribution*; D011634:Public Health; D012109:Research Support as Topic; D013038:Specialization; D014146:Training Support; D014481:United States