In an effort to recover repressed memories, hypnosis, guided visualizations, suggestion, age regression, and administering the drug amytal have been used. these and similar techniques can

The answer to this question is  can elicit fantasies that are mistaken for real memories
During the hypnosis process, the hypnotizer will try to bring out subconcious thought of the patient with psychological suggestion. This often bring out some memory that exist in their subconscious but suppressed due to some reason and the patient could mistake this suppressed memory as real memory.

in 1893 Williams opened Provident Hospital, the first medical facility to have an interracial staff. He was also one of the first physicians to successfully complete pericardial surgery on a patient. Williams later became chief surgeon of the Freedmen's Hospital.