Prolonged APTT of unknown etiology: A systematic evaluation of causes and laboratory resource use in an outpatient hemostasis academic unit by Ayla Cristina Nóbrega Barbosa, Silmara Aparecida Lima Montalvão, Kevan Guilherme Nóbrega Barbosa, Marina Pereira Colella, Joyce Maria Annichino-Bizzacchi, Margareth Castro Ozelo, Erich Vinicius De Paula

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