
ALT An illustrated diagram from the Clinical Practice article “Adult Attention Deficit–Hyperactivity Disorder” that shows the neurobiologic mechanisms of attention deficit–hyperactivity disorder (ADHD). It includes four overlapping circles labeled "Brain Structure," "Genetics," "Neurochemistry," and "Environmental Factors," each listing contributing elements. Additional text provides points on behavioral and cognitive features. The NEJM identity sits at the bottom.

ALT Women make up more than half the population, but most of what we know about women’s biology comes from extrapolation of studies in men. This has been changing in recent years, and this special issue highlights some of the progress in understanding the biological basis of sex differences in health and disease and medical issues relevant to women’s health across different stages of life. Illustration: Chiara Vercesi









































