Thank you Emmanola for taking your time and understanding my question. Indeed it is not about self pity or personal concerns. Rather, I consider it a research topic. Diabetes can affect vision, knee injury can affect spine, kidney disease has something to do with joints problems, blood pressure with stroke, etc. Every paper and article I saw talks about stutter causes, treatment or patient support. So it seems like one aspect of stutter is being overlooked. Or maybe I just cannot find the right sources.