Sustainment, Sustainability, and Spread Study (SSaSSy): protocol for a study of factors that contribute to the sustainment, sustainability, and spread of practice changes introduced through an evidence-based quality-improvement intervention in Canadian nursing homes

Berta WB, Wagg A, Cranley L, Doupe MB, Ginsburg L, Hoben M, MacEachern L, Chamberlain S, Clement F, Easterbrook A, Keefe JM, Knopp-Sihota J, Rappon T, Reid C, Song Y, Estabrooks CA.