About the Authors

Ulisses M Braga-Neto

Contributed equally to this work with: Ulisses M Braga-Neto, Ernesto T. A Marques Jr

To whom correspondence should be addressed. E-mail: ub@ieee.org

Ernesto T. A Marques Jr

Contributed equally to this work with: Ulisses M Braga-Neto, Ernesto T. A Marques Jr

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

UMBN and ETAM wrote the paper.