Journal of Epidemiology & Community Health
Vol.62, No.10, October 2008.
Cadernos de Saude Publica
Vol.24, Supplement 3, 2008.
Vol.24, Supplement 4, 2008.
Science
Vol.321, No. 5895, 12 September 2008.
Pediatrics
Vol.122, No.3, September 2008.
Clinical Infectious Diseases
Vol.47, Supplement 1, 15 September 2008.
Vol.47, No.6, 15 September 2008.
International Journal of Health Services
Vol.38, No.3, 2008.
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