American Journal of Epidemiology Advance Access originally published online on November 9, 2006
American Journal of Epidemiology 2006 164(12):1253-1254; doi:10.1093/aje/kwk094
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American Journal of Epidemiology Copyright © 2006 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.
LETTERS TO THE EDITOR |
THREE AUTHORS REPLY
1 Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115
2 Boston Collaborative Drug Surveillance Program, Boston University, Lexington, MA 02421
(e-mail: aalogut@alumni.unav.es)
| The first 10% of the full text of this article appears below. |
We thank Parratt et al. (1) for their interest in our study (2), in which we found a 50 percent reduction in the risk of multiple sclerosis among penicillin users (at least