The effect of calcium ( @ , @ , and @ mg/test meal ) on iron absorption in the absence and presence of AA ( @ , @ , and @ mg/test meal ) from a casein/whey-based drink fortified with ferrous sulfate was assessed in a series of randomized crossover studies both in iron-replete ( IR ) Indian schoolchildren and in children with iron deficiency anemia ( IDA ) ( @-@ y ; n = @-@ / group ) by using stable isotopes .