St Marys Hospital, England .
University of Porto, Portugal .
Public Health Div Gipuzkoa, Spain Spanish Consortium Research Epidemiol and Public Health CIBE, Spain .
University of Copenhagen, Denmark Copenhagen University Hospital, Denmark .
University of Crete, Greece .
University of Groningen, Netherlands .
University of Porto, Portugal .
University of Aberdeen, Scotland .
University of Aberdeen, Scotland .
University of Bern, Switzerland .
Academic Science Czech Republic, Czech Republic .
Linköping University, Department of Clinical and Experimental Medicine, Division of Clinical Sciences. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Center of Paediatrics and Gynaecology and Obstetrics, Department of Gynaecology and Obstetrics in Linköping.
Norwegian Institute Public Heatlh, Norway .
University of Medical Centre Utrecht, Netherlands .
University of Bologna, Bologna, Italy.
Lazio Regional Health Serv, Italy .
University of Basel, Switzerland .
University of Utrecht, Netherlands .
University of Bologna, Bologna, Italy.
University of Medical Centre Utrecht, Netherlands .
Nofer Institute Occupat Med, Poland .
University of Bristol, England .
INSERM, France University of Paris 11, France .
Spanish Consortium Research Epidemiol and Public Health CIBE, Spain University of Valencia, Spain University of Valencia, Spain .
University of Southampton, England .
Charite, Germany University of Wurzburg, Germany .
University of Coll Dublin, Ireland .
National School Public Heatlh, Greece .
University of Copenhagen, Denmark Copenhagen University Hospital, Denmark .
University of Bern, Switzerland .
University of Groningen, Netherlands .
Slovak Medical University, Slovakia .
University of Copenhagen, Denmark .
Charite, Germany .
Linköping University, Department of Clinical and Experimental Medicine, Division of Clinical Sciences. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Center of Paediatrics and Gynaecology and Obstetrics, Department of Paediatrics in Linköping.
Maastricht University, Netherlands .
University of Copenhagen, Denmark .
Slovak Medical University, Slovakia .
University of Southampton, England .
University of Turin, Italy .
Nofer Institute Occupat Med, Poland .
Lazio Regional Health Serv, Italy .
University of Turin, Italy .
St Marys Hospital, England .
University of Bern, Switzerland .
Academic Science Czech Republic, Czech Republic .
St Marys Hospital, England Spanish Consortium Research Epidemiol and Public Health CIBE, Spain Centre Research Environm Epidemiol CREAL, Spain Pompeu Fabra University, Spain Hospital del Mar, Spain .
Maastricht University, Netherlands .
University of Bologna, Italy .
University of Coll Dublin, Ireland .
National Institute Public Health and Environm RIVM, Netherlands .
St Marys Hospital, England Spanish Consortium Research Epidemiol and Public Health CIBE, Spain Centre Research Environm Epidemiol CREAL, Spain Pompeu Fabra University, Spain .
Erasmus MC, Netherlands Erasmus MC, Netherlands Erasmus MC, Netherlands .
Erasmus MC, Netherlands Erasmus MC, Netherlands Erasmus MC, Netherlands .