Long-term effectiveness and cost-effectiveness of guided internet-based cognitive behavioral therapy for obsessive-compulsive disorder: 24-month follow-up.

"Declaration of competing interest The authors declare no competing interest."

"Funding This study was funded by the Japan Society for the Promotion of Science KAKENHI Grant-in-Aid for Scientific Research (Grant Number 18K03130 and 22H00985), Takeda Science Foundation 2020 Medical Research Grant. The publication of the results from this study was also supported by the Young Researchers Support Program and the Research Associate Professor System at Kagoshima University."

"This study investigated the long-term outcomes of patients with OCD who underwent guided ICBT through an RCT and a rescue trial. Specific eligibility criteria, exclusion criteria, treatment strategies, and short-term outcomes have been previously detailed (). The original study was approved by the Chiba University Hospital Ethics Committee (G2019017) and registered in the Japanese Clinical Trial Registry (UMIN00039375). This follow-up study was approved by the Ethics Committee of Chiba University Graduate School of Medicine (ID: 3922)."