Problems with evidence assessment in COVID-19 health policy impact evaluation: a systematic review of study design and evidence strength

Noah A Haber, Emma Clarke-Deelder, Avi Feller, Emily R Smith, Joshua A Salomon, Benjamin MacCormack-Gelles, Elizabeth M Stone, Clara Bolster-Foucault, Jamie R Daw, Laura Anne Hatfield, Carrie E Fry, Christopher B Boyer, Eli Ben-Michael, Caroline M Joyce, Beth S Linas, Ian Schmid, Eric H Au, Sarah E Wieten, Brooke Jarrett, Cathrine Axfors, Beth Ann Griffin, Alyssa Bilinski, Elizabeth A Stuart