Monopoly of middle-aged men.
D001291:Attitude of Health Personnel; D002321:Career Choice; D004502:Education, Medical, Continuing / Q000639:trends; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010561:Personnel Staffing and Scheduling / Q000592:standards / Q000639:trends*; D010822:Physicians, Women; D011287:Prejudice; D006113:United Kingdom; D014481:United States; D014933:Women's Rights / Q000639:trends*