1 World Health Organization, Regional Office for Europe, European Centre for Environment and Health, Platz der Vereinten Nationen, 1, 53113 Bonn, Germany.
2 Unit of Environmental Epidemiology, Department of Environment and Primary Prevention, Istituto Superiore di Sanità, Viale Regina Elena, 299, 00161 Rome, Italy.
3 Escuela Andaluza de Salud Publica, Cuesta del Observatorio 4, 18080 Granada, Spain.