Institution: | 1. Department of Pathology and Laboratory Medicine, Women and Infants Hospital, Brown University, Providence, RI02905, U.S.A.;2. Foundation for Blood Research, Scarborough, ME04074, U.S.A.;3. Department of Obstetrics and Gynecology, Brigham and Women' s Hospital, Harvard Medical School, Boston, MA 0211.5, U.S.A. |