- Cathy L Melvin, PhD, MPH, Cecil G Sheps Center for Health Services Research, CB 7590, 725 Airport Road, University of North Carolina, Chapel Hill, NC 27599-7590, USA;
- Received December 6, 1999
- Revised March 2, 2000
- Accepted March 16, 2000
- First published September 1, 2000.
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