**Acknowledgements**

Thanks is due to the financial support to CESAM (UID/AMB/50017 - POCI-01-0145-FEDER-007638), to FCT/MCTES through national funds (PIDDAC), and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020. The PhD grant SFRH/ BD/79170/2011 (L.P. Sousa) supported by FCT is also acknowledged.
