Evaluate Protective Efficacy of Diff Strengths of Human Rotavirus Vaccine After Admn of 2 Doses to Infants Aged 2 Months [clinicaltrials:NCT00385320]

Evaluate Protective Efficacy of Diff Strengths of Human Rotavirus Vaccine After Admn of 2 Doses to Infants Aged 2 Months [clinicaltrials:NCT00385320]