Personalized exposure and experience sampling method feedback versus exposure as usual for obsessive-compulsive disorder: a study protocol for a randomized controlled trial.

"Declarations Ethics approval and consent to participate {24}This study has been approved by the Ethical Committee of Leiden, The Hague, and Delft (protocol number NL68816.058.19). All participants have given informed consent. Consent for publication {32}All participants have given informed consent for participation in this study and publication of the results. See Appendix 1 for a model consent form. Competing interests {28}AG works for NiceDay, the company that develops the smartphone application used in this study. Anja Greeven works as a senior researcher at NiceDay; however, this was not yet the case at the time the current study was initiated. She does not receive any (non-) financial remuneration for her role within the study. NiceDay has no control over the design, conduct, analyses, and reporting of the study. All other authors have no competing interests. Competing interests {28} AG works for NiceDay, the company that develops the smartphone application used in this study. Anja Greeven works as a senior researcher at NiceDay; however, this was not yet the case at the time the current study was initiated. She does not receive any (non-) financial remuneration for her role within the study. NiceDay has no control over the design, conduct, analyses, and reporting of the study. All other authors have no competing interests."

"Funding {4} The study has no funding."

"Trial registration ICTRP Trial NL8254. Registered on 2019–12-24."