Impacts of zero-fare transit policy on health and social determinants: protocol for a natural experiment study by Amanda Grimes, Jannette Berkley-Patton, Jenifer E. Allsworth, Joseph S. Lightner, Keith Feldman, Keith Feldman, Brent Never, Betty M. Drees, Betty M. Drees, Betty M. Drees, Betty M. Drees, Brian E. Saelens, Brian E. Saelens, Tiffany M. Powell-Wiley, Lauren Fitzpatrick, Lauren Fitzpatrick, Lauren Fitzpatrick, Carole Bowe Thompson, Madison Pilla, Madison Pilla, Madison Pilla, Kacee Ross, Kacee Ross, Kacee Ross, Chelsea Steel, Chelsea Steel, Chelsea Steel, Emily Cramer, Emily Cramer, Eric Rogers, Cindy Baker, Jordan A. Carlson, Jordan A. Carlson, Jordan A. Carlson, Jordan A. Carlson

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