[1] Portuguese Oncol Inst Porto IPO Porto, Porto Comprehens Canc Ctr Raquel Seruca Porto CCC, RISE CI IPOP Hlth Res Network, Res Ctr IPO Porto CI IPOP,Canc Biol & Epigenet Grp, Rua Dr Antonio Bernardino De Almeida, P-4200072 Porto, Portugal
[2] Ctr Hosp Univ S Joao, Rua Dr Antonio Bernardino De Almeida, P-4200072 Porto, Portugal
[3] Univ Barcelona, Inst Invest Biomed August Pi & Sunyer IDIBAPS, Dept Pathol, Dept Basic Clin Practice,Clin Barcelona, Barcelona, Spain
[4] Fac Med Univ Porto FMUP, Univ Hosp Ctr Sao Joao CHUSJ, Sch Hlth ESS Polytech Inst Porto P PORTO, Dept Pathol, Alameda Prof Hernani Monteiro, P-4200319 Porto, Portugal
[5] Osped Maggiore AUSL Bologna, Anat Patol, 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] Cork Univ Hosp, Dept Clin Biochem, Cork, Ireland
[10] Univ Coll Cork, Dept Obstet & Gynaecol, Pregnancy Loss Res Grp, Cork, Ireland
[11] Ctr Hosp Lyon Sud, Dept Pathol, Hosp Civils Lyon, Pierre Benite, France
[12] Imperial Coll NHS Trust, Charing Cross Hosp, Trophoblast Tumour Screening & Treatment Ctr, Fulham Palace Rd, London W6 8RF, England
[13] Oslo Univ Hosp, Dept Pathol, INNPATH Tirolkliniken, Innsbruck, Austria
[14] Cayenne Hosp Ctr Andree Rosemon, Dept Pathol, F-97306 Cayenne, France
[15] Cayenne Hosp Ctr Andree Rosemon, Ctr Biol Resources CRB Amazonie, F-97306 Cayenne, France
[16] Ghent Univ Hosp, Dept Pathol, Ghent, Belgium
[17] Ninewells Hosp & Med Sch, Scottish Hydatidiform Mole Follow Up Serv, Dundee, Scotland
[18] Aalborg Univ Hosp, Dept Clin Genet, Aalborg, Denmark
[19] Aarhus Univ, Dept Biomed, Aarhus, Denmark
[20] Inst Mother & Child Hlth, Dept Pathol, Warsaw, Poland
[21] Natl Matern Hosp, Dept Pathol, Dublin D02 YH21, Ireland
[22] Karolinska Univ Hosp, Dept Pathol & Canc Diagnost, Stockholm, Sweden
[23] Rouen Univ Hosp, Dept Pathol, Rouen, France
[24] Imperial Coll NHS Trust, Dept Pathol, North West London Pathol, Fulham Palace Rd, London W6 8RF, England
[25] Imperial Coll London, Charing Cross Hosp, Dept Surg & Canc, Fulham Palace Rd, London W6 8RF, England