State emergency medical services guidance and protocol changes in response to the COVID‐19 pandemic: A national investigation oleh Sylvia Owusu‐Ansah, Matthew Harris, Jennifer N. Fishe, Kathleen Adelgais, Ashish Panchal, John W. Lyng, Kerry McCans, Rachel Alter, Amanda Perry, Angelica Cercone, Phyllis Hendry, Mark X. Cicero