Postencephalitic Parkinsonism (PEP)
Here's your citation in American Psychological Association (APA) format:
Postencephalitic Parkinsonism (PEP). (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=Postencephalitic+Parkinsonism+%28PEP%29