Nelson LM, Williams VS, Carson R, Baird M, Coon C, Fehnel SE. Factor analyses of chronic constipation patient-reported outcome measures: results from phase 2b and phase 3 trials of linaclotide. Poster presented at the Annual Scientific Meeting of the American College of Gastroenterology; October 1, 2012. Previously presented at the Joint International Neurogastroenterology and Motility Meeting.