Funding
Research reported in this publication was supported by the National Center for Advancing Translational Sciences of the National Institutes of Health (Award Number UL1TR002553) and the Duke Clinical and Translational Science Award from the National Institutes of Health supported the collaboration between the Biostatistics, Epidemiology, and Research Design (BERD) Core and the Department of Surgery. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.