1. Faculty of Engineering, University of Porto, s/n, R. Dr Roberto Frias, 4200-465, Porto, Portugal
2. Federal Rural University of Pernambuco, R. Cento e Sessenta e Três, 300, Cabo de Santo Agostinho, PE, Brazil
3. Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235, 50670-901, Recife, PE, Brazil