Manhiça, in Mozambique. This study has been partially funded by the
Centre de Cooperació per al Desenvolupament (Universitat Politècnica
de Catalunya) and the Agencia Española de Cooperación Internacional
para el Desarrollo [reference 11-CAP2-1562]. Financial support of the
Agencia General d´Ajuts Universitaris i de Recerca -AGAUR- (Generalitatde Catalunya) through the Beatriu de Pinos grant (BP-DGR 2011) to
Dr A. Jiménez is also acknowledged.