Abstract:Ao Jockey Club de S~o Paulo, pelo financiamento da pesquisa, demonstrando interesse pela ciência. Ao Dr. Luiz Alberto Marinho, pelo apoio e confiança indispensâveis em nosso trabalho. Aos fiéis amigos Marco Antonio, Fab10la, Carlos Eduardo, Valéria e Soraia pela compreens~o nos momentos mais dificeis.
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