Abstract
This work was supported by the strategic pro- gramme UID/BIA/04050/2013 (POCI-01-0145- FEDER-007569) funded by national funds through the FCT I.P. and by the ERDF through the COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI). Support from FCT to SD is also acknowl- edged (SFRH/BPD/109842/2015). The authors want also to thank to Eduardo Conde-Sousa for the help during the construction of the geographic-distance matrix used in the current study.
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