Hasanoğlu, İmran, and Rahmet Güner. “Is There Any Evidence Implying the Use of a Different Criterion for Protective Anti-HBs Titer After HBV Vaccination in Immunosuppressed Patients?”. Turkish Journal of Gastroenterology, vol. 31, no. 4, Jan. 2020, pp. 346-7, doi:10.5152/tjg.2020.19040.