Homeless Outreach Psychiatric Engagement for Lisboa (HOPE 4 Lisboa): One year of marontology, and one John Doe living with Diogenes syndrome.

Background: In Europe, psychiatric disorders seem to affect up to 50% of the homeless. In Portugal there were, at a certain time, circa 3,396 homeless people, half living in the capital city, Lisboa.

Aims: The Homeless Outreach Psychiatric Engagement for Lisboa (HOPE 4 Lisboa) was created, in January 1st 2022, as a collaboration including staff from the local state asylum, medical school and town hall in Lisboa, Portugal, in order to provide better treatment for the super difficult cases of psychiatric patients living homeless in Lisboa.