Ashraf M, Rageh A, Gilbert M, Tolls D, Fleming A, Souka A, El-Baha S, Cavallerano JD, Sun JK, Aiello LP, Silva PS. Factors affecting predominantly peripheral lesion identification and grading. Transl Vis Sce Techn. 2021 Jun 1;10(7):6. doi: 10.1167/tvst.10.7.6
Williams VSL. The "unbiased" anchor: bridging the gap between DIF and item bias. Appl Meas Educ. 1997;10(3):253-67. doi: 10.1207/s15324818ame1003_4