Prevalence of thrombophilia-associated genetic risk factors in blood donors of a regional hospital in southern Brazil Jéssica Dick-Guareschi; Juliana Cristine Fontana; Maria Teresa Vieira Sanseverino; Francyne Kubaski; Leo Sekine; Nanci Félix Mesquita; Tor Gunnar Hugo Onsten; Sandra Leistner-Segal;