Trypanosoma cruzi parasitemia in chronic chagas disease: comparison between human immunodeficiency virus (HIV)- positive and HIV - negative patients - Sartori, Ana Marli Christovam; Eluf Neto, José; Nunes, Elizabeth Visone; Braz, Lucia Maria Almeida; Caiaffa Filho, Helio Hehl; Oliveira Junior, Oswaldo Cruz; Amato Neto, Vicente; Shikanai-Yasuda, Maria Aparecida (Journal of Infectious Diseases, 2002)