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References
1. IAP guidebook on Immunization. Available at URL: http://www.iapcoi.com/pdf/IAP%20GUIDE%20BOOK%20ON%20IMMUNIZATION%20INDIVIDUAL%20VACCINES.pdf. Accessed on 15th May 2011
2. Pickering LK, Orenstein WO. Active Immunization. Principles and Practice of Pediatric Infectious Diseases Revised, 3rd ed. Churchill Livingstone 2009: 48-71.
3. Braaten KP, Laufer MR. Human Papillomavirus (HPV), HPV-Related Disease, and the HPV Vaccine. Rev Obstet Gynecol. 2008 Winter; 1: 2-10.