Map of Asthma Diagnosis in Mecklenburg County. Map of Mecklenburg County, NC showing Geographic Information Systems (GIS) analysis of the 6,800 patients with a primary diagnosis of asthma seen within the community clinic network over 1 year. The map shows patient density per square mile.
Tapp et al. BMC Health Services Research 2011 11:188 doi:10.1186/1472-6963-11-188