efforts to achieve effective and meaningful patient and public involvement (ppi) in healthcare have existed for nearly a century, albeit with limited success. this brief commentary discusses a recent paper by carter and martin exploring the “challenges facing healthwatch, a new consumer champion in england,” and places these challenges in the context of the broader struggle to give a voice to h...

In this study, we introduce a new two-way relay channel and obtain an inner bound and an outer bound for the discrete and memoryless multiple access relay channels with receiver-source feedback via two-way relay channel in which end nodes exchange signals by a relay node. And we extend these results to the Gaussian case. By numerical computing, we show that our inner bound is the same with o...