1. Department of Preventive Veterinary Medicine ‐ State University of Londrina ‐ UEL Londrina Brazil
2. Center of Health Sciences ‐ State University of Londrina ‐ UEL Londrina Brazil
3. Department of Statistics State University of Londrina ‐ UEL Londrina Brazil
4. Institute of Tropical Medicine of São Paulo ‐ IMT São Paulo Brazil