1. Department of Geography and Land Management University of Zaragoza Zaragoza Spain
2. University Institute for Research in Environmental Sciences of Aragon (IUCA) Zaragoza Spain
3. Aragon Health Service. Government of Aragon. Borja Primary Care Center Borja Spain
4. Lozano Blesa University Clinic Hospital Zaragoza Spain
5. Pneumology Service Royo Villanova Hospital Zaragoza Spain
6. Institute for Health Research Aragon, IISA Zaragoza Spain