**Funding:** None.

**Acknowledgments:** N. Martins thank to Portuguese Foundation for Science and Technology (FCT–Portugal) for the Strategic project ref. UID/BIM/04293/2013 and "NORTE2020-Programa Operacional Regional do Norte" (NORTE-01-0145-FEDER-000012). Also, this work was supported by CONICYT PIA/APOYO CCTE AFB170007.

**Conflicts of Interest:** The authors declare no conflict of interest.
