Quasi-experimental study designs series—paper 1: introduction: two historical lineages. Bärnighausen T, Røttingen JA, Rockers P. T Bärnighausen, JA Røttingen, P Rockers… - Journal of clinical …, 2017 - Elsevier GSID: eNVJhIXociUJ
Defining the criteria for including studies and how they will be grouped for the synthesis. [No authors listed] GSID: a_0XV7WC5C8J