NEW YORK (AP) ¿ Pfizer Inc. says the Food and Drug Administration is again extending its review of Prevnar 13, a children's pneumococcal vaccine. The FDA's decision was due Wednesday, but Pfizer says the agency has not completed its review. It did not say when the process might be complete. The FDA was originally scheduled to make a decision by Sept. 30, but decided to extend that review by three months. Prevnar 13 is intended to reduce the risk of infection by 13 types of pneumococcal disease, which can cause ear infections, meningitis, pneumonia and blood infections. It is a newer version of a vaccine that has been on the market for nine years, and considered one of the most important products Pfizer acquired when it bought rival Wyeth for $68 billion this year.