1. Federal Rural University of the Semiarid, BR-233, s/n, Caraúbas, Rio Grande do Norte 59780-000, Brazil
2. Federal Rural University of the Semiarid, BR-226, s/n, Pau dos Ferros, Rio Grande do Norte 59900-000, Brazil
3. Federal University of the Agreste of Pernambuco, Avenida Bom Pastor, s/n, Garanhuns, Pernambuco 55292-270, Brazil