Cost-effectiveness of a modified two-step algorithm using a combined glutamate dehydrogenase/toxin enzyme immunoassay and real-time PCR for the diagnosis of Clostridium difficile infection. - Vasoo S; Stevens J; Portillo L; Barza R; Schejbal D; Wu MM; Chancey C; Singh K (Journal of microbiology, immunology, and infection = Wei mian yu gan ran za zhi, 2014)