- Correspondence to:
Dr J D Lewis
University of Pennsylvania, 720 Blockley Hall, 423 Guardian Drive, Philadelphia, PA 19104-6021, USA;
- Accepted January 4, 2005
- Revised December 22, 2004
- First published July 11, 2005.
Competing interest: JDL has received research support and has served as a consultant for Wyeth and GlaxoSmithKline. BIK has received research funding from Centocor. AK, AGF, and CB report no potential conflicts of interest.
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