Correction: High prevalence of elevated blood lead levels in both rural and urban Iowa newborns: Spatial patterns and area-level covariates

• Margaret Carrel, 
• David Zahrieh, 
• Sean G. Young, 
• Jacob Oleson, 
• Kelli K. Ryckman, 
• Brian Wels, 
• Donald L. Simmons, 
• Audrey Saftlas