Resident-to-resident elder mistreatment (R-REM) intervention for direct care staff in assisted living residences: study protocol for a cluster randomized controlled trial oleh Jeanne A. Teresi, Stephanie Silver, Mildred Ramirez, Jian Kong, Joseph P. Eimicke, Gabriel D. Boratgis, Rhoda Meador, Leslie Schultz, Mark S. Lachs, Karl A. Pillemer