An alternative proposal: the single entry level.
D000575:American Nurses' Association; D004508:Education, Nursing, Baccalaureate; D004510:Education, Nursing, Diploma Programs; D006801:Humans; D009729:Nursing / Q000592:standards*; D009743:Nursing, Practical / Q000193:education; D009871:Operating Room Nursing; D012956:Societies, Nursing; D014481:United States