Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es|Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es|Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es|Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es|Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es|Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es|Center for research in environmental epidemiology (CREAL), Barcelona, Spain. jrgonzalez@imim.es