1. World Health Organization.Hepatitis B. Fact sheet.http://www.who.int/mediacentre/factsheets/fs204/en/Accessed Aug 31 2019.
2. World Health Organization.Guidelines for the prevention care and treatment of persons with chronic hepatitis B infection. WHO Press. Geneva Switzerland:2015 166p.
3. ScuderiMA.DNA Vaccines for the Prevention and Treatment of Hepatitis B Virus.http://biology.kenyon.edu/slonc/bio38/scuderi/index.html/Accessed Sep 16 2019.
4. GanemD.Hepadnaviridae and their replication. In: Fields B.N. Knipe D.M. Howley P.M. editors. Fields Virology 3rd ed. Philadelphia:Lippincott‐Raven 2703–2738;1996.
5. Presence of HBV DNA in spermatozoa: A possible vertical transmission of HBV via the germ line