County-level air quality and the prevalence of diagnosed chronic kidney disease in the US Medicare population. oleh Jennifer Bragg-Gresham, Hal Morgenstern, William McClellan, Sharon Saydah, Meda Pavkov, Desmond Williams, Neil Powe, Delphine Tuot, Raymond Hsu, Rajiv Saran, Centers for Disease Control and Prevention CKD Surveillance System