PROmotion of COvid-19 VA(X)ccination in the Emergency Department—PROCOVAXED: study protocol for a cluster randomized controlled trial oleh Robert M. Rodriguez, Kelli O’Laughlin, Stephanie A. Eucker, Anna Marie Chang, Kristin L. Rising, Graham Nichol, Alena Pauley, Hemal Kanzaria, Alexzandra T. Gentsch, Cindy Li, Herbie Duber, Jonathan Butler, Vidya Eswaran, Dave Glidden