Random Assignment
We randomized by clinician clusters identified on the basis of paired connections between physicians and APPs within networks of practice colleagues. Clusters were formed between clinicians with overlapping patient pools to reduce cross-cluster contamination. The clusters were not site-specific as many clinicians worked at multiple sites. We formed 95 clusters from 246 clinicians. Patients were nested under clinician clusters and assigned to an arm based upon the clinician they saw at their index visit, preventing crossover.