Occurrence of periodontal pathogens in ethnic groups from a native Brazilian reservation - Gaetti-Jardim Junior, Elerson; Pereira, Maurício Fabiano; Vieira, Evanice Menezes Marçal; Schweitzer, Christiane Marie; Okamoto, Ana Cláudia; Ávila-Campos, Mario Julio (Archives of Oral Biology, 2015)