Clark M, Berry P, Martin S, Harris N, Sprecher D, Olitsky S, Hoag JB. Nosebleeds in hereditary hemorrhagic telangiectasia: development of a patient-completed daily eDiary. Laryngoscope Investig Otolaryngol. 2018 Nov 14;3(6):439-45. doi: 10.1002/lio2.211
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