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2531050
2531050
http://dx.doi.org/10.2307/2531050
More on "Biased selection of controls for case-control analyses of cohort studies".
P356
Q41351321-76744271-A082-4EA9-952F-1A12BA98325A
P356
2531050
http://dx.doi.org/10.2307/2531050