Bukowski, Radek; Hansen, Nellie I.; Pinar, Halit; Willinger, Marian; Reddy, Uma M.; Parker, Corette B.; Silver, Robert M.; Dudley, Donald J.; Stoll, Barbara J.; Saade, George R.; Koch, Matthew A.; Rowland Hogue, Carol J.; Varner, Michael W.; Conway, Deborah L.; Coustan, Donald; Goldenberg, Robert L.; Eunice Kennedy Shriver National Institute of Child Health and Human Development Stillbirth Collaborative Research Network