3103363 NTCD non-toxigenic C. difficile 12 3103366 NTCD non-transmissible chronic diseases 7 3103360 NTCD nontoxigenic Clostridium difficile 7 3103362 NTCD non-T cell-depleted 2 3103365 NTCD non-toxigenic strain of C. difficile 2 3103369 NTCD N-trichloromethylthio-4-cyclohexane-1,2-dicarboximide 1 3103370 NTCD National Tobacco Control Directive 1 3103368 NTCD negative TCD 1 3103361 NTCD neural tube closure defects 1 3103359 NTCD non-toxigenic C. difficile colonization 1 3103367 NTCD non-toxigenic strains of Clostridioides difficile 1 3103364 NTCD nonuniform time-varying communication delays 1