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Data were labeled as indeterminate by at least 1 reviewer for 18 (3%) of 524 relevant data fields. The Cohen κ for all dichotomous data fields together was 0.81 (95% confidence interval, 0.61-1.. For all continuous (time-based) variables combined, the intraclass correlation coefficient was 0.88 (95% confidence interval, 0.70-0.96). CONCLUSIONS Initial simulation-based testing suggests video-based data collection using the VIPER registry is feasible and reliable. Our next step is to assess feasibility and reliability for actual pediatri