1. Prepare the data | 2. Establish a threshold for distance | 3. Create strata: candidate matches for final analysis | 4. Prepare final matched sets for analysis | 5. Calculate odds ratios | 5.1 Mantel–Haenszel test and Fisher's exact test | 5.2 Conditional logistic regression | 5.3 Penalized logistic regression | 6. Calculate population attributable fraction (PAF) | 7. Multiple imputation of missingness | 8. Helper function cacheit() | 9. Run the analysis on your local computer or HPC | 9.1 local computer | 9.2 HPC | References: