Nothing
red.cell.folate<-data.frame(
folate=c(243,251,275,291,347,354,380,392,206,210,226
,249,255,273,285,295,309,241,258,270,293,328),
ventilation=factor(rep(1:3,c(8,9,5)),
labels=c("N2O+O2,24h","N2O+O2,op","O2,24h"))
)
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