Dr. Stephen Gluckman, forensic investigator in the Faculty of Medicine of the University of Pennsylvania, and specialist in diagnosing the cause of death of historic figures, describes his work as follows:  "The practice of medicine centuries after the facts that concern us requires a lot of patience, thinking and imagination. In this type of medical facts, all possibilities are studied, the impossible (or very unlikely) ones are discarded and the possible causes are organized in a hierarchy".