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A multistage sampling strategy was used with 'city' as the first stratum, 'university' as the second stratum, and 'study year' (from first to final study year) as the third stratum.
The selected hospitals formed the first stratum.
The 7 schistosome-endemic provinces represented the first stratum.
So the first stratum was Jan 01 to Jan 28, 2007, the second stratum was Jan 29 to Feb 25.
The initial sample of residents constituted the first stratum for the current study.
The first strata were 'contracted GPs' and 'private GPs'.
Unsworth's 21st-century readers inhabit a third stratum.
The third stratum consisted solely of the general factor, g, as identified by Spearman.
The third stratum, which has large thickness, is consisted by soils with poor engineering properties.
This first one is an unconfined aquifer, which is primarily the pore water in the third stratum.
The third stratum consisted of the household.
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