plm adverse [4 articles]
Journal of Public Economics, Vol. 80, No. 1. (April 2001), pp. 25-48.
Social Science & Medicine., Vol. 37, No. 5. (1993), pp. 623-31.
Eur J Epidemiol, Vol. 15, No. 9. (Oct 1999), pp. 839-45.
Am J Public Health, Vol. 92, No. 3. (Mar 2002), pp. 420-2.
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