1. Environmental Health Department, National Health, Porto, Portugal
2. Institute of Public Health (ISPUP), Porto University, EpiUnit - Epidemiology Research Unit, Porto, Portugal
3. CEAUL, NOVA Medical School, Lisbon, Portugal
4. Epidemiology and Statistics Analisys Unit, Research Centre, Centro Hospitalar de Lisboa Central, EPE, Lisbon, Portugal
5. CEDOC – Respiratory Diseases Research Group, NOVA Medical School, Lisbon, Portugal
6. Serviço de Imunoalergologia, Hospital de Dona Estefânia, Centro Hospitalar de Lisboa Central, EPE, Lisbon, Portugal
7. Unit of Clinical and Molecular Epidemiology, IRCCS San Raffaele, Pisana, Rome, Italy
8. National Laboratory for Civil Engineering, Lisbon, Portugal