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Am J Epidemiol 2003; 158:191.
Copyright © 2003 by Johns Hopkins Bloomberg School of Public Health

LETTERS TO THE EDITOR

THREE OF THE AUTHORS REPLY

Timo E. Strandberg1, Sture Andersson2,3 and Anna-Liisa Järvenpää2

1 Department of Medicine, University of Helsinki, Helsinki, Finland.
2 Department of Pediatrics, University of Helsinki, Helsinki, Finland.
3 Department of Obstetrics and Gynecology, University of Helsinki, Helsinki, Finland.

The first 10% of the full text of this article appears below.

We thank Hughes et al. (1) for their interest in our study (2), but we do not think their concerns affect the reliability of our results.

The first study (3) was performed at a secondary-level hospital with less research activity, whereas the . . . [Full Text of this Article]


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