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18.1.269
18.1.269
http://dx.doi.org/10.1093/IJE/18.1.269
Ecological bias, confounding, and effect modification.
P356
Q38632643-04BF2110-060E-422F-83FD-105FAEAE66B7
P356
18.1.269
http://dx.doi.org/10.1093/IJE/18.1.269