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