Affiliation: | 1. University of California, Berkeley 2. University of British Columbia, USA 3. Tulsa Area Health and Hospital, Planning Council Tulsa, Oklahoma 4. Economics Division, Library of Congress, USA 5. University of Denver, Colorado 6. California State Polytechnic University, Pomona 7. Oregon State University, Corvallis 8. University of Nevada, Las Vegas 9. University of Colorado, USA
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