Department of Pathology, Cancer Biology & Epigenetics Group, Research Center of IPO Porto (CI-IPOP) / RISE@ CI-IPOP (Health Research Network), Portuguese Oncology Institute of Porto (IPO Porto) / Porto Comprehensive Cancer Center Raquel Seruca (Porto.CCC) and Centro HospitalarUniversitário S. João, Rua Dr. António Bernardino de Almeida, 4200‑072, Porto, Portugal

Carla Bartosch

Department of Pathology, Clínic Barcelona, Department of Basic Clinical Practice, Universitat de Barcelona, Institut d’Investigacions Biomèdiques August Pi I Sunyer (IDIBAPS), Barcelona, Spain

Alfons Nadal

Department of Pathology, University Hospital Centre of São João (CHUSJ) / Faculty of Medicine - University of Porto (FMUP) / School of Health (ESS) - Polytechnic Institute of Porto (P. PORTO), Alameda Prof. Hernâni Monteiro, 4200-319, Porto, Portugal

Ana C. Braga

Anatomia Patologica, Ospedale Maggiore AUSL Bologna, Bologna, Italy

Angela Salerno

Division of Clinical Pathology, Geneva University Hospital, Geneva, Switzerland

Anne‑Laure Rougemont & Jean‑Christophe Tille

Department of Pathology, University Hospitals Leuven, Louvain, Belgium

Anne‑Sophie Van Rompuy

Department of Pathology, Cork University Hospital, Cork, Ireland

Brendan Fitzgerald

Department of Clinical Biochemistry, Cork University Hospital, Ireland/ Pregnancy Loss Research Group, Department of Obstetrics & Gynaecology, University College Cork, Cork, Ireland

Caroline Joyce

Department of Pathology, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre Bénite, France

Fabienne Allias

Trophoblastic Tumour Screening & Treatment Centre, Imperial College NHS Trust, Charing Cross Hospital, Fulham Palace Road, London, W6 8RF, UK

Geoffrey J. Maher

Department of Pathology, Oslo University Hospital, INNPATH Tirolkliniken, Innsbruck, Austria

Gitta Turowski

Department of Pathology and Center of Biological Resources (CRB Amazonie), Cayenne Hospital Center Andrée Rosemon, 97306, Cayenne, France

Kinan Drak Alsibai

Department of Pathology, Ghent University Hospital, Ghent, Belgium

Koen Van de Vijver

Scottish Hydatidiform Mole Follow‑Up Service, Ninewells Hospital and Medical School, Dundee, Scotland

Lesley McMahon

Department of Clinical Genetics, Aalborg University Hospital, Denmark/Department of Biomedicine, Aarhus University, Aalborg, Aarhus, Denmark

Lone Sunde

Department of Pathology, Institute of Mother and Child, Warsaw, Poland

Michal Pyzlak

Department of Pathology, National Maternity Hospital, Dublin, D02YH21, Ireland

Paul Downey

Department of Pathology and Cancer Diagnostics, Karolinska University Hospital, Stockholm, Sweden

Sandra Wessman

Department of Pathology, Rouen University Hospital, Rouen, France

Sophie Patrier

Department of Pathology, North West London Pathology, Imperial College NHS Trust, Fulham Palace Road, London, W6 8RF, UK

Baljeet Kaur

Department of Surgery and Cancer, Imperial College London, Charing Cross Hospital, Fulham Palace Road, London, W6 8RF, UK

Rosemary Fisher