Randomization and Masking
We conducted randomization at the provider (not patient) level by allocating to one of four nudge (intervention) arms or control arm (1:1:1:1:1), and stratifying by setting (primary care or mental health) and location (Portland, Vancouver, or other). A statistician (MN) masked to intervention information used block randomization with random block sizes of 5, 10, or 15, assigning providers to one of five study arms using the blockrand (v 1.5) R package