1. IGA Research Group, Area of Hydraulic Engineering, High Polytechnic School of Engineering Avila, Salamanca University, Av. de los Hornos Caleros, 50, 05003 Ávila, Spain
2. CIDTA, Faculty of Pharmacy, Salamanca University, Campus Miguel de Unamuno, C/Licenciado Méndez Nieto, 37008 Salamanca, Spain
3. IGA Research Group, Department of Statistics, Salamanca University, Campus Miguel de Unamuno, C/Alfonso X El Sabio s/n, 37007 Salamanca, Spain