Why income is up.
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D004526:Efficiency; D005250:Fees, Dental / Q000639:trends; D017048:Health Care Costs / Q000706:statistics & numerical data; D005102:Health Expenditures / Q000639:trends; D006801:Humans; D007182:Income / Q000639:trends; D011215:Practice Management, Dental / Q000191:economics* / Q000639:trends; D011331:Private Practice / Q000191:economics* / Q000639:trends; D013997:Time Factors; D014481:United States