**Author details**

Alcimar Barbosa Soares\* and Adriano de Oliveira Andrade *Laboratory of Biomedical Engineering, Faculty of Electrical Engineering, Federal University of Uberlândia, Brazil* 

Edgard Afonso Lamounier Júnior and Alexandre Cardoso *Laboratory of Computer Graphics and Virtual Reality, Faculty of Electrical Engineering, Federal University of Uberlândia, Brazil* 
