Anchor: One possibility is that studies report different estimates of the single true relationship between a given pollutant and a health effect due to differences in study design, random chance, or other factors.
Entailed: The studies have various reports.
Contradiction: The reports are perfect.
Contradiction: I don't like country western.
Contradiction: The men are wearing safety equipment on their heads.
Contradiction: A kid sitting on the beach.
Contradiction: A human standing