- Correspondence to: Myra A Crawford, PhD, Division of Research, University of Alabama at Birmingham, School of Medicine, Department of Family and Community Medicine, 930 South 20th Street, Room 325, Birmingham, AL 35205 USA;
- Received November 17, 2000
- Accepted October 12, 2001
- Revised March 20, 2001
- First published March 1, 2002.
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