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- [35] Pneumococcal Conjugate Vaccine-elicited Antibody Persistence and Immunogenicity and Safety of 13-Valent Pneumococcal Conjugate Vaccine in Children Previously Vaccinated with 4 Doses of Either 7-Valent or 13-Valent Pneumococcal Conjugate Vaccine PEDIATRIC INFECTIOUS DISEASE JOURNAL, 2014, 33 (10) : 1065 - 1076