Development of common disorders involves a complex interplay of multiple factors. We may assume that many genes and many environmental factors are involved. Future gene–environmental cohort studies ...

For those not familiar with the term, a “meta-analysis” is a quantitative, formal, epidemiological study design used to systematically assess the results of previous research to derive conclusions ...

A new BMJ collection examines how well designed large scale research can benefit global health With a population of 1.4 billion—nearly a fifth of the global total—and rapid societal transformations, ...