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Vital and health statistics - Series 3. - Analytical studies / National Center for Health Statistics, United States.-- (1964) -  (1981) -.-- Washington ISSN 0083-2065   Texto Completo Gratuito - Livre acesso URL http://www.cdc.gov/nchs/products/pubs/pubd/series/sr03/pre-31/pre-31.htm