Long-term Follow-up on Immunogenicity & Safety of Measles-Mumps-Rubella-Varicella (MMRV) Combined Vaccine [clinicaltrials:NCT00406211]

Long-term Follow-up on Immunogenicity & Safety of Measles-Mumps-Rubella-Varicella (MMRV) Combined Vaccine [clinicaltrials:NCT00406211]