Author’s reply
Tài liệu tham khảo
WHO SEARO. Weekly AFP Update for week 37. Immunization and Vaccine Development. World Health Organization. South-East Asia Regional Office 2004.
AFP Alert. The eleventh meeting of the India Expert Advisory Group for Polio Eradiction Delhi, India. 10–11 June 2004. NPSP. 2004; 8: 2.
www.polioeradiction.org accessed on 13-9-2004.