In contrast to extensive attention on model selection for cross-sectional data, research on model selection for longitudinal data remains largely unexplored. This is ...

Scanning electron microscopy (SEM) studies 16,17,18,19 have reported conflicting results with reference to the marginal adaptation of MTA to root-canal walls. For example, Torabinejad et al. 16 and ...

As we begin a new semester, we are always looking for examples that illustrate economic principles. Fortunately, the world is filled with them, often in our own backyard. Two come to mind. Our ...