Detection of Occult Hepatitis C Virus Infection in Patients Who Achieved a Sustained Virologic Response to Direct-acting Antiviral Agents for Recurrent Infection After Liver Transplantation, Mohamed Said Abdel Aziz, Zienab Mostafa Saad, Wael Mohamed Abdel Ghani, Rofida Khalifa Moftah, International Journal Of Pure Medical Research, Volume : 2, Issue : 1, January - 2017