[1] CI IPOP RISECI IPOP Hlth Res Network, Portuguese Oncol Inst Porto, Res Ctr IPO Porto, IPO Porto Porto Comprehens Canc Ctr Raquel Seruca, Rua Dr Antonio Bernardino Almeida, P-4200072 Porto, Portugal
[2] CHU S Joao, Rua Dr Antonio Bernardino Almeida, Rua Dr, P-4200072 Porto, Portugal
[3] Univ Barcelona, Inst Invest Biomed August PiSunyer IDIBAPS 1, Dept Pathol, Clin Barcelona,Dept Basic Clin Practice, Barcelona, Spain
[4] Univ Porto FMUP, Univ Hosp Ctr Sao Joao CHUSJ, Sch Hlth ESS, Polytech Inst Porto P PORTO,Dept Pathol,Fac Med, Alameda Prof Hernani Monteiro, P-4200319 Porto, Portugal
[5] Osped Maggiore AUSL Bologna, Anat Patolog, Bologna, Italy
[6] Geneva Univ Hosp, Div Clin Pathol, Geneva, Switzerland
[7] Univ Hosp Leuven, Dept Pathol, Louvain, Belgium
[8] Cork Univ Hosp, Dept Pathol, Cork, Ireland
[9] Univ Coll Cork, Cork Univ Hosp, Dept Clin Biochem, Dept Obstet & Gynaecol,Ireland Pregnancy Loss Res, Cork, Ireland
[10] Ctr Hospitalier Lyon Sud, Dept Pathol, Hosp Civils Lyon, Pierre Ben, France
[11] Imperial Coll Hosp NHS Trust, Charing Cross Hosp, Trophoblast Tumour Screening & Treatment Ctr, Fulham Palace Rd, London W6 8RF, England
[12] Oslo Univ Hosp, INNPATH Tirolkliniken, Dept Pathol, Innsbruck, Austria
[13] Cayenne Hosp Ctr Andree Rosemon, Dept Pathol, F-97306 Cayenne, France
[14] Cayenne Hosp Ctr Andree Rosemon, Ctr Biol Resources CRB Amazonie, F-97306 Cayenne, France
[15] Ghent Univ Hosp, Dept Pathol, Ghent, Belgium
[16] Ninewells Hosp, Med Sch, Scottish Hydatidiform Mole Follow Up Serv, Dundee, Scotland
[17] Aarhus Univ, Aalborg Univ Hosp, Dept Clin Genet, Denmark Dept Biomed, Aarhus, Denmark
[18] Inst Mother & Child Hlth, Dept Pathol, Warsaw, Poland
[19] Natl Matern Hosp, Dept Pathol, Dublin D02YH21, Ireland
[20] Karolinska Univ Hosp, Dept Pathol & Canc Diagnost, Stockholm, Sweden
[21] Rouen Univ Hosp, Dept Pathol, Rouen, France
[22] Imperial Coll NHS Trust, Dept Pathol, North West London Pathol, Fulham Palace Rd, London W6 8RF, England
[23] Imperial Coll London, Charing Cross Hosp, Dept Surg & Canc, Fulham Palace Rd, London W6 8RF, England