Fig. 2
From: Increase in fertility following coal and oil power plant retirements in California
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12940-018-0388-8/MediaObjects/12940_2018_388_Fig2_HTML.gif)
Identification of exposed and unexposed births based on last menstrual period among California mothers, 2001–2011
From: Increase in fertility following coal and oil power plant retirements in California
Identification of exposed and unexposed births based on last menstrual period among California mothers, 2001–2011