**Acknowledgments**

The authors are thankful for the financial support from São Paulo State Foundation (FAPESP) —Grant #2013/26257‐8, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)—Grant #302710/2013‐2 and also Pró‐Reitoria de Pesquisa—Universidade Estadual Paulista (PROPe—UNESP). Special thanks are given to Danilo Sanches Moreno for his substantial contribution to the art of drawing and figures.
