A quantitative, cross-sectional, descriptive study was conducted in two consecutive series, corresponding to 2007 and 2008 Series 1: 2007, Series 2: 2008.
Se ha realizado un estudio cuantitativo descritivo transversal, en dos series consecutivas que corresponden al año 2007 y 2008 Serie 1: 2007, Serie 2: 2008.