http://www.who.int/mediacentre/factsheets/fs204/en/index.html
http://www.cdc.gov/hepatitis/HBV/StatisticsHBV.htm
http://www.medscape.com/viewarticle/471470
http://www.emedicinehealth.com/hepatitis_b/page14_em.htm#prevent
http://www.who.int/mediacentre/factsheets/fs204/en/
http://www.medicinenet.com/hepatitis_b/page9.htm#prevent
http://www.hepb.org/professionals/prevention_measures.htm
http://bestpractice.bmj.com/bestpractice/monograph/127/basics/pathophysiology.html
http://id.wikipedia.org/wiki/Hepatitis_B
http://emedicine.medscape.com/article/177632-overview
