American Journal of Epidemiology Advance Access originally published online on June 10, 2009
American Journal of Epidemiology 2009 170(2):266-267; doi:10.1093/aje/kwp159
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American Journal of Epidemiology © The Author 2009. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.
LETTERS TO THE EDITOR |
THE PRIMARY AUTHORS REPLY
Center for Environmental Health, New York State Department of Health, Troy, NY 12180
(e-mail: sxl05@health.state.ny.us)
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We appreciate the comments by Payne and Mijal (1) on our paper (2). They stated that a seasonal effect has been suggested for gastroschisis in some previous literature (3, 4), although the findings were not consistent, and that asthma exacerbations follow seasonal cycles. Therefore, season may be related to both exposure and outcome. Payne