Randomization
BLIND
Stratified randomization with one constrained covariate was used to assign PCCs 1:1 to the stigma reduction or attention-control training group. The intervention clinic at which the PCC practiced was a stratifying variable, and PCC waiver status (waivered, not waivered) was balanced study-wide across training groups. The study statistician (ALC) generated the randomization assignment using SAS software prior to PCCs being invited to complete the training. PCCs were blind to training assignment.