Acknowledgements The National Institutes of Health, the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), and the National Center for Advancing Translational Sciences provided grant support for the Neonatal Research Network’s Generic Database Study. While NICHD staff had input into the study design, conduct, analysis, and manuscript drafting, the comments and views of the authors do not necessarily represent the views of NICHD, the National Institutes of Health, the Department of Health and Human Services, or the U.S. Government. Participating NRN sites collected data and transmitted it to RTI International, the data coordinating center (DCC) for the network, which stored, managed and analyzed the data for this study. On behalf of the NRN, RTI International had full access to all of the data in the study, and with the NRN Center Principal Investigators, takes responsibility for the integrity of the data and accuracy of the data analysis. We are indebted to our medical and nursing colleagues and the infants and their parents who agreed to take part in this study. Additional investigators, in addition to those listed as authors, can be found in the Supplement. Due to an error in the submitted data, the author group was not correctly reflected. This has now been adjusted and the acknowledgement corrected. The information of Investigators from the NICHD Neonatal Research Network can be found as Supplementary Information. The original article has been corrected.