Validation of Prediction Rules for Computed Tomography Use in Children With Blunt Abdominal or Blunt Head Trauma: Protocol for a Prospective Multicenter Observational Cohort Study oleh Irma T Ugalde, Pradip P Chaudhari, Mohamed Badawy, Paul Ishimine, Kevan A McCarten-Gibbs, Kenneth Yen, Nisa S Atigapramoj, Allyson Sage, Donovan Nielsen, P David Adelson, Jeffrey Upperman, Daniel Tancredi, Nathan Kuppermann, James F Holmes