<qa>  What is the name of the group that showed that high-intensity NIV improveMore than 10 years ago, the concept of high-intensity NIV in COPD was introduced. By applying higher inspiratory pressures and breathing frequencies aimed at a more controlled form of ventilation and improvement in gas exchange, clinically relevant improvements in HRQoL and lung function were observed, without undue loss of patient comfort. Recently, a German group conclusively showed that high-intensity NIV improves survival in severe COPD patients with CHRF. These positive results with high-intensity NIV have changed our view towards the use of chronic NIV in stable COPD. Nowadays, the investigators believe that the evidence for long-term nocturnal NIV is convincing and justifies the application of this therapy in patients with severe stable COPD patients with CHRF. Nevertheless, for a broader implementation of this treatment in a potentially large group of severe COPD patients, important issues have to be solved. 