[Influenza vaccination: coverage of Portuguese population from 1998/1999 a 2002/2003]
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Between 1999 and 2003 the Portuguese National Health Observatory, has conducted four telephone surveys (1998/99, 1999/00, 2001/02 and 2002/03) using the ECOS - Em Casa Observamos Saúde - panel of Portuguese families, with telephone aiming at studying the infl... ...
