The origin of Freud's early work with psychoanalysis can be linked to Josef Breuer. Freud credited Breuer with opening the way to the discovery of the psychoanalytical method by his treatment of the case of Anna O. In November 1880, Breuer was called in to treat a highly intelligent 21-year-old woman (Bertha Pappenheim) for a persistent cough that he diagnosed as hysterical. He found that while nursing her dying father, she had developed a number of transitory symptoms, including visual disorders and paralysis and contractures of limbs, which he also diagnosed as hysterical. Breuer began to see his patient almost every day as the symptoms increased and became more persistent, and observed that she entered states of "absence". He found that when, with his encouragement, she told fantasy stories in her evening states of "absence" her condition improved, and most of her symptoms had disappeared by April 1881. Following the death of her father in that month her condition deteriorated again. Breuer recorded that some of the symptoms eventually remitted spontaneously, and that full recovery was achieved by inducing her to recall events that had precipitated the occurrence of a specific symptom. In the years immediately following Breuer's treatment, Anna O. spent three short periods in sanatoria with the diagnosis "hysteria" with "somatic symptoms", and some authors have challenged Breuer's published account of a cure. Richard Skues rejects this interpretation, which he sees as stemming from both Freudian and anti-psychoanalytical revisionism — revisionism that regards both Breuer's narrative of the case as unreliable and his treatment of Anna O. as a failure. Psychologist Frank Sulloway contends that "Freud's case histories are rampant with censorship, distortions, highly dubious 'reconstructions,' and exaggerated claims."