1. Uberlândia Integrated Teaching and Training Center, Uberlândia 38400-000, MG, Brazil
2. Anesthesia Department, Universidade Federal de Uberlândia, Uberlândia 38405-318, MG, Brazil
3. Anesthesia Department, Hospital Mater Dei Santa Genoveva, Uberlândia 38400-000, MG, Brazil
4. Anesthesia Department, Uberlândia Medical Center, Uberlândia 38411-186, MG, Brazil
5. Faculty of Medicine, Universidade Federal de Goiás, Goiânia 74690-900, GO, Brazil