Chung Y, Kim JS, Youk HJ, Hwang SH, Oh HB, Kim H, , Ko DH.  A Pilot Project for the Expansion of the External Quality Assessment Program in Transfusion Medicine: Anti-D Titer Test.  Lab Med Qual Assur 2022;44:99-104.  https://doi.org/10.15263/jlmqa.2022.44.2.99