The reality of spatial variations of morbidity and mortality.
D000293:Adolescent; D000367:Age Factors; D004196:Disease Outbreaks / Q000453:epidemiology; D004938:Esophageal Neoplasms / Q000453:epidemiology; D005006:Ethnicity; D005260:Female; D006801:Humans; D008297:Male; D009017:Morbidity; D009026:Mortality; D009369:Neoplasms / Q000453:epidemiology; D011153:Population; D011336:Probability; D012042:Registries; D012737:Sex Factors; D013019:South Africa