1. Department of Vaccine Clinical Evaluation, Jiangsu Center for Disease Control and Prevention, Nanjing, JS, P. R. China
2. Department of Infectious Disease, Huaiyin Center for Disease Control and Prevention, Huai’an, JS, P. R. China
3. Vaccine Research and Development, Pfizer Inc, Collegeville, PA, USA
4. Clinical Development, Pfizer Vaccine Research, Beijing, P. R. China
5. Vaccine Research and Development, Pfizer Inc, Pearl River, NY, USA