The Daily Californian, January 22, 2010 by Mary Ann Mason
http://www.dailycal.org/article/107911/a_look_at_the_phd_problem
Not surprisingly, perceived unfriendliness to one’s family concerns within a research-intensive university—and especially the difficulty in childrearing with a successful scientific career—was shown to be a major factor for female doctoral students to “leak out” of the scientific pipeline.