Wang, Susan A., Hyde, Terri B., Mounier-Jack, Sandra, Brenzel, Logan, Favin, Michael, Gordon, W. Scott, Shearer, Jessica C., Mantel, Carsten F., Arora, Narendra, Durrheim, David. Elsevier; 2013. New vaccine introductions: assessing the impact and the opportunities for immunization and health systems strengthening.