Take the following as truth: To reflect concerns about the inherent limitations in the number of studies supporting a causal association between long-term exposure and mortality, an Alternative benefit estimate was derived from the large number of time-series studies that have established a likely causal relationship between short-term measures of PM and daily mortality statistics.
Then the following statement: "The big number of time-series studies was used to create an Alternative benefit estimate." is true, false, or inconclusive?