Chlorhexidine bathing and infections in critically ill patients--reply.

uncertain. Important study limitations include not capturing drugs dispensed in hospitals. We could not ascertain if the women were actually breastfeeding at the time of codeine dispensation. In addition, we used data on drugs dispensed, which is not the same as drugs used. However, there is no reason to believe that the proportion of filled prescriptions that are not taken would systematically differ over time.