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Determine the concentration at the beginning of the interval
pk.calc.cstart(conc, time, start)
The concentration when time == end. If none match, then NA
time == end
NA
Observed concentrations during the interval
Times of conc observations
conc
Start time of the interval
Other NCA parameters for concentrations during the intervals: pk.calc.clast.obs(), pk.calc.cmax(), pk.calc.ctrough()
pk.calc.clast.obs()
pk.calc.cmax()
pk.calc.ctrough()