Correction: Fine Particulate Matter and Incident Cognitive Impairment in the REasons for Geographic and Racial Differences in Stroke (REGARDS) Cohort

• Matthew Shane Loop, 
• Shia T. Kent, 
• Mohammad Z. Al-Hamdan, 
• William L. Crosson, 
• Sue M. Estes, 
• Maurice G. Estes Jr, 
• Dale A. Quattrochi, 
• Sarah N. Hemmings, 
• Virginia G. Wadley, 
• Leslie A. McClure