Luciano JV, Barrada JR, Aguado J, Osma J, García-Campayo J. Bifactor analysis and construct validity of the HADS: a cross-sectional and longitudinal study in fibromyalgia patients. Psychological Assessment. 2014 Jun;26(2):395-406.
Wong-Sefidan I, Byrtek M, Zhou X, Dawson K, Friedberg J, Flowers CR, Zelenetz A, Reid E. Non-clinical factors drive imaging patterns after induction therapy of follicular lymphoma (FL): report from the National LymphoCare Study (NLCS). Poster presented at the 2013 12th International Conference on Malignant Lymphoma; June 2013. Lugano, Switzerland. [abstract] Hematol Oncol. 2013 Jun 17; 31(S1):255.
Phanikumar CV, Maitra B. Willingness-to-pay and preference heterogeneity for rural bus attributes. J Transp Eng A-Syst. 2007 Jan;133(1).