Rousu MC, Monchuk DC, Shogren JF, Kosa KM. Consumer willingness to pay for “second generation” genetically engineered products and the role of market information. J Agr Appl Econ. 2005 Dec;37(3):647-57. doi: 10.1017/S1074070800027140
Yost KJ, Yount SE, Eton DT, Silberman C, Broughton-Heyes A, Cella D. Validation of the Functional assessment of cancer therapy-Breast Symptom Index (FBSI). Breast Cancer Res Treat. 2005 Apr 1;90(3):295-8.