Here's a weird one: A 4-day mindfulness-based cognitive behavioural intervention program for CFS/ME. An open study, with one-year follow-up. https://www.frontiersin.org/articles/10.3389/fpsyt.2018.00720/abstract These people seem to be implying that four days of CBT will fix your "CFS/ME" permanently, showing continued improvement at one year follow-up. Oxford of course. And all subjective surveys, of course. But man! Can you imagine telling someone they had a major psychiatric disorder but that four days of therapy would cure them permanently?