Acceptability and Outcomes of Transdiagnostic Guided Self-help Bibliotherapy for Internalizing Disorder Symptoms in Adults: A Fully Remote Nationwide Open Trial.

"all code and deidentified data are available on the open science foundation (osf) site ( https://osf io/j32uw/ )."

"Declarations Conflict of InterestProfessor Lorenzo-Luaces has received consulting fees from Happify Health, Inc. who had no role in the current research. Jacqueline Howard, Robinson De Jesús-Romero, Allison Peipert, John Buss, Colton Lind, Kassandra Botts Isabella Starvaggi declare that they have no conflict of interest. Research Involving Human Participants and/or AnimalsAll procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional and/or National Research Committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Indiana University IRB. Informed ConsentInformed consent was obtained from all individual participants included in the study. Conflict of Interest Professor Lorenzo-Luaces has received consulting fees from Happify Health, Inc. who had no role in the current research. Jacqueline Howard, Robinson De Jesús-Romero, Allison Peipert, John Buss, Colton Lind, Kassandra Botts Isabella Starvaggi declare that they have no conflict of interest."

"Funding This research was partially funded by the National Institute of Mental Health Grant Number T32 MH103213-06 which provided support for Peipert, De Jesús-Romero, Buss, and Starvaggi and Grant Numbers KL2TR002530 and UL1TR002529 (A. Shekhar, PI) from the National Institutes of Health, National Center for Advancing Translational Sciences, Clinical and Translational Sciences Award which provided support for Professor Lorenzo-Luaces. The work was also supported the 2020 Global Mental Health Fellowship through the APA and IUPsys."

"This study was approved by Indiana University’s Institutional Review Board. Participant recruitment began October 17, 2020, and ended February 21, 2022. All recruitment was conducted online and all participants provided informed consent for the study. The study was registered on ClinicalTrials.gov on July 1, 2021 (NCT04870099)."