A case series of sage: a new couple-based intervention for borderline personality disorder.

"Declarations Ethics approval and consent to participateThis study received approval from all relevant institutional research ethics boards (York University, 2020–303; Toronto Metropolitan University, 2020–411; University Health Network, 21–6228). All participants provided informed consent to participate in this study. Consent for publicationNot applicable. Competing interestsDrs. Fitzpatrick, Liebman, and Monson provide trainings in psychotherapy related to BPD treatment and the conjoint treatment of posttraumatic stress disorder. Dr. Monson receives royalties for the publication of Cognitive Behavioral Conjoint Therapy for posttraumatic stress disorder and Cognitive Processing Therapy for posttraumatic stress disorder treatment manuals. Competing interests Drs. Fitzpatrick, Liebman, and Monson provide trainings in psychotherapy related to BPD treatment and the conjoint treatment of posttraumatic stress disorder. Dr. Monson receives royalties for the publication of Cognitive Behavioral Conjoint Therapy for posttraumatic stress disorder and Cognitive Processing Therapy for posttraumatic stress disorder treatment manuals."

"Funding This project was funded by the American Foundation for Suicide Prevention (Pilot Innovation Grant; PRG-0–057-19; PI Fitzpatrick) and the Stratas Foundation. Other than approving it for funding, these funders had no role in the design of the study, data collection, data analysis, or interpretation of findings."

"Trial registration This project was pre-registered at Clinicaltrials.gov (Identifier: [NCT04737252])."