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The authors regret that the first footnote to the article was incorrect. The footnote should read as follows:
1 This research was supported in part by USPHS research grants DA-01999 (JES), DA-00114 (JES), DA-03628 (JES) and DA-06634 (JES, SID). All research was conducted according to the Guide for the Care and Use of Laboratory Animals as adopted and promulgated by the National Institutes of Health.
- 1996 by The American Society for Pharmacology and Experimental Therapeutics