title: The great zebra hunt: a view of internal medicine from the walk-in clinic.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D007388:Internal Medicine / Q000193:education / Q000639:trends*; D010044:Outpatient Clinics, Hospital; D011315:Preventive Medicine; D011320:Primary Health Care; D014481:United States