R. Yu, I. M. Chamen, K. A. Punzalan, B. De Vera III, and E. Arcellana-Nuqui, “Validation using Nucleic Acid Testing (NAT) on Blood Donor Samples Non-Reactive to Transfusion-Transmissible Viruses by Immunoassay (EIA/ChLIA)”, Phil Journal Path, vol. 2, no. 1, p. 39, Dec. 2016.