McMichael AJ, Kane JPM, Rolison JJ, O'Neill FA, Boeri M, Kee F. Implementation of personalised medicine policies in mental healthcare: results from a stated preference study in the UK. BJPsych Open. 2022 Feb 3;8(2):e40. doi: 10.1192/bjo.2022.9
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