ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] Obviously any study in which, for example, the smoking history was obtained during pregnancy rather than after delivery is at an advantage. We believe, however, that the type of bias inherent in any retrospective survey is unlikely to have occurred to any marked extent in the present series because ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/242263a0
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