Search the Community
Showing results for tags '70 pages survey designed'.
"Characterization, Frequency and Severity of Visual Phenomenology in Adults with Hallucinogen Persisting Perception Disorder" Name and address of the principal investigator David S. Kozin, Site where the study will be performed: Online. The study will be carried out at the office of the principal investigator with 256-bit SSL encrypted server access. Introduction Hallucinogen Persisting Perception Disorder (HPPD) is a persisting, post-substance use disorder characterized by the diagnostic criterion of “the re-experiencing, following cessation of use of a hallucinogen, o