title: What don't we know, and when did we know that we didn't know it?
authors.affiliation: Department of Pathology, University of California, San Francisco, CA, USA.
authors.forename: Philip E
authors.initials: PE
authors.lastname: Leboit
mesh_terms: D003880:Dermatology / Q000379:methods*; D003937:Diagnosis, Differential; D003875:Drug Eruptions / Q000150:complications / Q000175:diagnosis*; D005076:Exanthema / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D008214:Lymphocytes / Q000473:pathology; D018103:Morbillivirus / Q000302:isolation & purification / Q000472:pathogenicity; D018185:Morbillivirus Infections / Q000175:diagnosis*; D010336:Pathology / Q000379:methods*