NDEH, F. J.; ASEMOTA, E. A.; OKPOKAM, D. C.; EKEAGBA, I. I. ABH Substances Secretion Status, ABO & Rhesus Blood Groups Typing and P24 Antigen Screening in HIV 1 and 2 Screened Antibody-negative Apparently Healthy Prospective Blood Donors in Calabar, Nigeria. International Journal of Research and Reports in Hematology, v. 3, n. 2, p. 1-25, 2 nov. 2020.