Both current and future generations must share these costs in a way that does not overburden particular cohorts. (religion-online.org)
For one thing, they are a snapshot of gender distribution in a single year, 2008, and say nothing about the progression of any particular cohort. (sciencemag.org)
You could envision that, if a particular cohort was studying a woman's first pregnancy, by providing resources to that group you could then study a second pregnancy. (sciencemag.org)