1. Department of Pathology; Paediatric and Pregnancy Related Pathology; Oslo University Hospital; Oslo Norway
2. Department of Pathology; Feinberg School of Medicine; Northwestern University; Chicago IL USA
3. Department of Anatomical Pathology; The Children's Hospital; Westmead NSW Australia
4. Department of Obstetrics; Oslo University Hospital; Oslo Norway
5. Faculty of Medicine; University of Oslo; Oslo Norway
6. Faculty of Biological, Medical and Human Sciences; School of Medical Sciences; Maternal and Fetal Health Research Centre; University of Manchester; Manchester UK
7. St. Mary's Hospital; Central Manchester University Hospitals NHS Foundation Trust; Manchester Academic Health Science Centre; Manchester UK