1. Centre for Research in Environmental Epidemiology, Barcelona, Spain
2. Municipal Institute of Medical Research (IMIM-Hospital del Mar), Barcelona, Spain
3. Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública, Barcelona, Spain
4. Pompeu Fabra University, Barcelona, Spain
5. Servei de Salut, Ajuntament de Sabadell, Sabadell, Spain
6. Servei de Ginecologia i Obstetrícia, Hospital de Sabadell, Sabadell, Spain