[1] Brigham & Womens Hosp, Dept Obstet & Gynecol, Div Gynecol Oncol, 75 Francis St, Boston, MA 02115 USA
[2] Massachusetts Gen Hosp, Vincent Dept Obstet Gynecol & Reprod Biol, Boston, MA USA
[3] Harvard Med Sch, Dept Obstet Gynecol & Reprod Biol, Boston, MA USA
[4] Harvard Canc Ctr, Dana Farber Canc Inst, Susan F Smith Ctr Womens Canc, Gynecol Oncol Program, Boston, MA USA
[5] Donald P Goldstein MD Trophoblast Tumor Registry, New England Trophoblast Dis Ctr, Boston, MA USA
[6] Univ Fed Sao Paulo, Paulista Sch Med, Sao Paulo Hosp, Dept Obstet, Sao Paulo, Brazil
[7] Univ Fed Sao Paulo, Paulista Sch Med, Sao Paulo Hosp, Trophoblast Dis Ctr, Sao Paulo, Brazil