[Specialization in health care and the nurse specialist].
D006281:Health Occupations / Q000639:trends; D006801:Humans; D007564:Japan; D008511:Medicine / Q000639:trends*; D009720:Nurse Clinicians; D013038:Specialization / Q000639:trends*; D013041:Specialties, Nursing / Q000639:trends*; D014481:United States