Center for Research in Environmental Epidemiology, Doctor Aiguader 88, Barcelona 08003, Spain. acaceres@creal.cat|Center for Research in Environmental Epidemiology, Doctor Aiguader 88, Barcelona 08003, Spain. acaceres@creal.cat|Center for Research in Environmental Epidemiology, Doctor Aiguader 88, Barcelona 08003, Spain. acaceres@creal.cat|Center for Research in Environmental Epidemiology, Doctor Aiguader 88, Barcelona 08003, Spain. acaceres@creal.cat