Christensen T, Riis AH, Hatch EE, Wise LA, Nielsen MG, Rothman KJ, Toft Sorensen H, Mikkelsen EM. Costs and efficiency of online and offline recruitment methods: a web-based cohort study. J Med Internet Res. 2017 Mar 1;19(3):e58. doi: 10.2196/jmir.6716
Mangel AW, Williams VSL. Asimadoline in the treatment of irritable bowel syndrome. Expert Opin Investig Drugs. 2010 Oct 1;19(10):1257-64.