Contributions of the NICHD neonatal research network's generic database to documenting and advancing the outcomes of extremely preterm infants

Edward F. Bell, Barbara J. Stoll, Nellie I. Hansen, Myra H. Wyckoff, Michele C. Walsh, Pablo J. Sánchez, Matthew A. Rysavy, Jenna H. Gabrio, Stephanie W. Archer, Abhik Das, Rosemary D. Higgins