Title {1}	Internet-based Cognitive Behavioral Therapy for Improving Health-Related Quality of Life in Patients with Endometriosis: Study Protocol for a Randomized Controlled Trial.
Trial registration {2a and 2b}.	ClinicalTrials.gov, Identifier NCT05098444. Date of registration: 10/28/2021
Protocol version {3}	First version (dated 11/11/2021)
Funding {4}	Philipps-University Marburg, Marburg, Germany. This trial is non-commercial. We received a local grant called UMRvernetzt from Philipps-University Marburg, which is set up to encourage interdisciplinary exchange. The grant went to the construction of the iCBT platform. There is no external funding for this study.
Author details {5a}	1, 2, 5 Philipps-University Marburg, Dept. of Psychology, Division of Clinical Psychology and Psychotherapy, Marburg, Germany 3, 4 Clinic for Gynecology and Obstetrics, University Hospital of Giessen and Marburg (UKGM), Marburg, Germany.
Name and contact information for the trial sponsor {5b}	Trial Sponsor: UMR 2027, Philipps-University Marburg. Address: UMR 2027, Biegenstraße 36, 35032 Marburg, Germany. Email: interaktion@uni-marburg.de
Role of sponsor {5c}	The funder has no role in study design, analysis, interpretation, or publication of the study protocol and trial results.