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Bibliography:Address for correspondence: Maria Irma Seixas Duarte, Av. Dr Eneas de Carvalho Aguiar 470 (1st floor, room 33), 05403-000 São Paulo-SP, Brazil; fax +55 11 280 4945.
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ISSN:0035-9203
1878-3503
DOI:10.1016/S0035-9203(97)90267-4