Käyhty H, O'Brien K L, Goldblatt D
Department of Vaccination and Immune Protection, National Institute for Health and Welfare, Helsinki, Finland.
Center for American Indian Health & International Vaccine Access Center, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States.
Vaccine. 2013 Dec 17;32(1):131-2. doi: 10.1016/j.vaccine.2013.05.066.