1. EPIUnit – Institute of Public Health, University of Porto, Porto, Portugal
2. Occupational Health Service of the Hospital Epidemiology Centre, São João Hospital Centre, Porto, Portugal
3. Department of Clinical Epidemiology, Predictive Medicine and Public Health, University of Porto Medical School, Porto, Portugal
4. Environmental Health Department, School of Allied Health Technologies of Polytechnic Institute of Porto (ESTSP.IPP), Vila Nova de Gaia, Portugal