1. GEURBAN Research Group, Dept. of Geography, Urban and Regional Planning, School of Civil Engineering, Univ. of Cantabria, Ave. Los Castros, 44, 39005 Santander, Spain (corresponding author).
2. Menntun Consultoría Científica S.L.; Antoni Maria Alcover 22, 3°-1°; Palma de Mallorca, 07011 Islas Baleares, Spain.