Fig. 4
From: Assessing the short term impact of air pollution on mortality: a matching approach
Number of times each control day is selected as a matched control, Milan, Italy, 2003–2006
Fig. 4 | Environmental Health
From: Assessing the short term impact of air pollution on mortality: a matching approach
Number of times each control day is selected as a matched control, Milan, Italy, 2003–2006
Environmental Health