Copenhagen Unit for Respiratory Epidemiology (CURE) will perform state-of-the-art epidemiological research based in Danish national health registers to answer current important questions regarding patients with chronic pulmonary diseases like chronic obstructive lung disease and interstitial lung diseases. Members of CURE are a mix of highly skilled researchers with a background in medical epidemiology and trials published in journals like The Lancet and other important medical journals, and junior investigators (typically PhD students) who coordinate and run one or more projects. The philosophy of the group is that epidemiology, basic research and randomized trials work well together to generate, explore and answer core scientific questions within respiratory medicine. All these key approaches will be used in the COPD Trial Initiative (COP:TRIN) and CURE is the epidemiological branch of the network.