‘Vampirism’ in Case of Multiple Personality (Dissociative Identity) (1) by Dr. Vedat Sar (2): Dracula is fiction, but multiple personality is seen in real life.

1. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2463803
2. https://en.wikipedia.org/wiki/Vedat_%C5%9Ear