Nag A, Martin SA, Mladsi D, Olayinka-Amao O, Purser M, Vekaria RM. The humanistic and economic burden of chronic idiopathic constipation in the USA: a systematic literature review. Clin Exp Gastroenterol. 2020 Jul 16;(13):255-65. doi: 10.2147/CEG.S239205
Liu SY, Trope GE, Buys YM, El-Defrawy SR, Khan AM, Jin YP. Visual impairment and the Ontario disability support program. Can J Ophthalmol. 2020 Jun;55(3):212-20. doi: 10.1016/j.jcjo.2019.12.009
Boeri M, Myers K, Ervin C, Marren A, DiBonaventura M, Cappelleri JC, Hauber B, Rubin DT. Patient and physician preferences for ulcerative colitis treatments in the United States. Clin Exp Gastroenterol. 2019 Jun 11;12:263-78. doi: 10.2147/CEG.S206970
Fehnel S, Fiedorek FT, Nelson L, DiBenedetti D, Spence S, Carson RT. Development and psychometric evaluation of the Diabetic Gastroparesis Symptom Severity Diary. Clin Exp Gastroenterol. 2019 Feb 22;12:93-103. doi: 10.2147/CEG.S184016
DiTrapani J, Rockwood N, Jeon M. Explanatory IRT analysis using the SPIRT macro in SPSS. TQMP. 2018;14(2):81-98. doi: 10.20982/tqmp.14.2.p081
Nelson LM, Williams VS, Fehnel SE, Carson RT, MacDougall J, Baird MJ, Tourkodimitris S, Kurtz CB, Johnston JM. Psychometric validation of patient-reported outcome measures assessing chronic constipation. Clin Exp Gastroenterol. 2014 Sep 26;7:385-94.
Ervin CM, Fehnel SE, Baird MJ, Carson RT, Johnston JM, Shiff SJ, Kurtz CB, Mangel AW. Assessment of treatment response in chronic constipation clinical trials. Clin Exp Gastroenterol. 2014 Jun 3;7:191-8. doi: 10.2147/CEG.S58321. eCollection 2014