drugExposureSampleDoc: Helper for consistent documentation of `drugExposureSample`.
Description
Helper for consistent documentation of `drugExposureSample`.
Arguments
drugExposureSample
The number of people to take a random sample for
drug diagnostics. If `drugExposureSample = NULL`, no sampling will be
performed. If `drugExposureSample = 0` drug diagnostics will not be
run.