paranoid personality disorder vs postpartum depression

paranoid personality disorder

noun
  • A mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others. 

postpartum depression

noun
  • Depression experienced by a parent, usually the mother, after childbirth. 

How often have the words paranoid personality disorder and postpartum depression occurred in a corpus of books? (source: Google Ngram Viewer )