Tita, Alan T.;
Doherty, Lindsay;
Roberts, Jim M.;
Myatt, Leslie;
Leveno, Kenneth J.;
Varner, Michael W.;
Wapner, Ronald J.;
Thorp, John M.;
Mercer, Brian M.;
Peaceman, Alan;
Ramin, Susan M.;
Carpenter, Marshall W.;
Iams, Jay;
Sciscione, Anthony;
Harper, Margaret;
Tolosa, Jorge E.;
Saade, George R.;
Sorokin, Yoram;
for the National Institute of Child Health and Human Development Maternal-Fetal Medicine Units Network:
Smarr, Melissa M.;
Louis, Germaine M. Buck;
Albert, Paul S.;
Kim, Sungduk;
Fuchs, Karin M.;
Grewal, Jagteshwar;
D'Alton, Mary E.;
Grantz, Katherine L.: