In the early stages of the pandemic, it was thought that antibodies produced post-infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) provide a certain degree of protection ...

In clinical trials with multiple visits, dropouts often occur and the population of patients who dropped out may be different from the population of patients who completed the study. To assess ...

Comparative effectiveness research increasingly is being recognized as a priority area in cancer research. Although researchers have been conducting comparative effectiveness research for decades, ...