@article {14375, title = {Changes in the Incidence and Duration of Periods Without Insurance}, journal = {New England Journal of Medicine}, volume = {360}, number = {17}, year = {2009}, pages = {1740-1748}, url = {http://www.nejm.org/doi/full/10.1056/NEJMsa0804668}, author = {David M Cutler and Alex Gelber} }