YouTubevideo480https://www.youtube.com/1.0Prof Timothy Barrett - Designing a clinical trial in a slowly progressive rare disease - RDC 2017360270RCPCH480https://i.ytimg.com/vi/hiXYOkgmAR0/hqdefault.jpghttps://www.youtube.com/user/rcpchuk<iframe width="480" height="270" src="https://www.youtube.com/embed/videoseries?list=PLnZ0WSeOKq5ycPOEySFWqww0GXVl8Wlp7" frameborder="0" allowfullscreen></iframe>