Strutton DR, Farkouh RA, Earnshaw SR, Hwang S, Theidel U, Kontodimas S, Klok R, Papanicolaou S. Cost-effectiveness of 13-valent pneumococcal conjugate vaccine: Germany, Greece, and The Netherlands. J Infect. 2012 Jan 1;64(1):54-67.
Cates SC, Kosa KM, Karns S, Godwin SL, Speller-Henderson L, Harrison R, Ann Draughon F. Food safety knowledge and practices among older adults: identifying causes and solutions for risky behaviors. J Nutr Elder. 2009 Apr;28(2):112-26. doi: 10.1080/01639360902949986
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