The term “large-scale” is not meant to exclude rare diseases. The study should propose a sample size that is sufficiently large to allow for precise estimation of hypothesized effect sizes or for clear demonstration of non-inferiority; however, there is no absolute number associated with “large.” In addition, the sample size must support testing of at least one a priori hypothesis related to potential differences in effectiveness in relevant patient subgroups (heterogeneity of treatment effects). We welcome studies on rare diseases, provided that your study sample size is large enough to assure that the results will be valid and readily applicable to the population with the condition.
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