1. Department of Obstetrics and Gynecology; Queen Mary Hospital; University of Hong Kong; Hong Kong China
2. Departments of Histopathology and Medical Oncology; Charing Cross Trophoblastic Disease Center; Charing Cross Campus of Imperial College London; London UK
3. Department of Obstetrics and Gynecology; Division of Gynecologic Oncology; Brigham and Women's Hospital; Dana-Farber Cancer Institute; Harvard Medical School; Boston MA USA
4. Department of Obstetrics and Gynecology; Peking Union Medical College Hospital; Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing China
5. Department of Obstetrics and Gynecology; French Trophoblastic Disease Reference Centre; Lyon University Hospital; Claude Bernard Lyon 1 University; Lyon France
6. Department of Obstetrics and Gynecology; Institute of Maternal and Child Health; Medical College; Calicut India
7. John I. Brewer Trophoblastic Disease Center; Northwestern University Feinberg School of Medicine; Chicago IL USA
8. Division of Gynecologic Oncology; Department of Obstetrics and Gynecology; Radboud University Medical Centre Nijmegen; Nijmegen Netherlands