Title {1}	Watchful Waiting as a Strategy to Reduce Low-Value Spinal Imaging: Study Protocol for a Randomized Trial
Trial registration {2a and 2b}.	NCT 04255199, ClinicalTrials.gov (January 16, 2020)
Protocol version {3}	September 9, 2020
Funding {4}	Agency for Healthcare Quality and Research (R18HS026415)
Author details {5a}	Departments of Family & Community Medicine, Pediatrics, and the Center for Healthcare Policy and Research, University of California, Davis. Sutter Institute for Medical Research, Sacramento, CA.
Name and contact information for the trial sponsor {5b}	Denise Burgess Program Official Center for Quality Improvement and Patient Safety Agency for Healthcare Research and Quality 5600 Fishers Lane Rockville, MD 20857 tel: 301-427-1318 email: denise.burgess@ahrq.hhs.gov
Role of sponsor {5c}	The study sponsor had no role in the study design; data collection, management, and analysis, and interpretation; in the writing of the report; or the decision to submit the report for publication.