- 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 17 November 2000
- Accepted 12 October 2001
- Revised 20 March 2001
- Published online 1 March 2002.
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