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Journal of Clinical Epidemiology > 1997 > 50 > 11 > 1231-1240
Journal of Clinical Epidemiology > 1997 > 50 > 11 > 1241-1248
Journal of Clinical Epidemiology > 1997 > 50 > 11 > 1231-1240
Journal of Clinical Epidemiology > 1997 > 50 > 11 > 1241-1248