Perhaps not so rare?
McKay
D
D
D000293:Adolescent; D014150:Antipsychotic Agents / Q000009:adverse effects*; D003024:Clozapine / Q000009:adverse effects*; D006801:Humans; D008297:Male; D010309:Parotitis / Q000139:chemically induced*
D014150:Antipsychotic Agents; D003024:Clozapine