Title {1}	Elucidating Treatment Targets and Mediators within a Confirmatory Efficacy Trial: Study Protocol for a Randomized Controlled Trial of Cognitive-Behavioral Therapy vs. Light Therapy for Winter Depression
Trial registration {2a and 2b}.	Clinicaltrials.gov identifier: NCT03691792.
Protocol version {3}	Protocol Version 20, 01/31/2022
Funding {4}	This study is funded by the National Institute of Mental Health (R01MH112819-01A1).
Author details {5a}	Kelly J. Rohan and Pamela M. Vacek, University of Vermont; Peter L. Franzen, Kathryn A. Roecklein, Greg Siegle, and David Kolko, University of Pittsburgh; Teodor T. Postolache, University of Maryland
Name and contact information for the trial sponsor {5b}	National Institute of Mental Health, 6001 Executive Boulevard Room 6200, MSC 9663, Bethesda, MD 20892-9663; phone: 1-866-615-6464 (toll-free), Email: nimhinfo@nih.gov
Role of sponsor {5c}	The funding agency has/had no role in the design, collection, management, analysis, or interpretation of data; the writing of the manuscript; or the decision to submit the study protocol for publication. The funding agency has no ultimate authority over any of these activities.