Exemplars U5M Interview Guide: This is an example of the semi-structured interview guide used for key informant interviews described in the article, "Development and application of a hybrid implementation research framework to understand success in reducing under-5 mortality in Rwanda." Extended data (supplemental) tables and figures: These are the supplemental tables and figures to accompany the article, "Development and application of a hybrid implementation research framework to understand success in reducing under-5 mortality in Rwanda."...