Journal Article 15/06/2015 Validation of infant immunization billing codes in administrative dataSchwartz KL, Tu K, Wing L, Campitelli MA, Crowcroft NS, Deeks SL, Wilson SE, Wilson K, Gemmill I, Kwong JC. Hum Vaccin Immunother. 2015; 11(7):1840-7. Epub 2015 Jun 15.