?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Khakoo%2C+Salim+Iqbal&rft.aufirst=Salim+Iqbal&rft.aulast=Khakoo&rft.inst=University+College+London&rft.degree=Doctoral&rft.date=1997&rft.tpages=192&rft.title=Immunological+and+virological+factors+in+chronic+hepatitis+B+infection.