| GDP | Gross Domestic Product |
| VIF | Variance Inflation Factor |
| OECD | Organization for Economic Cooperation and Development |
| OLS | Ordinary Least Squares |
| CI | Confidence Interval |
| PPS | Purchasing Power Standard |
| IHME | Institute for Health Metrics and Evaluation |
| HC1 | Heteroskedasticity-Consistent Type 1 |
| COVID-19 | Coronavirus Disease 2019 |
| GBD | Global Burden of Disease |
| WHO | World Health Organization |
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