Occult HBV infection among anti-HBc positive HIV-infected patients in apex referral centre, Eastern India oleh R. Panigrahi, S. Majumder, M. Gooptu, A. Biswas, S. Datta, P.K. Chandra, A. Banerjee, S. Chakrabarti, D. Bandopadhyay, B.K. De, R. Chakravarty, Ph.D.