Thanks. I don't know anything about your educational background, so I won't dive in too deep into the thoeretical issues here, but your paper will need to address the following point if you, like so many others, try to suggest stuttering (an action) is somehow rooted in the genes: Why are most stutterers fluent when they are alone? My eye color doesn't change when I'm alone. And even when I stuttered badly, I didn't stutter on every word. Think deeply about those two points in the context of gene expression. As another example of the same thing, what genes are responsible for walking? Anyway, that's food for thought. Maybe you're a grad student trying to get a masters or phd or something, so I do not want to dissuade you, but I am skeptical that this correlational piece will generate anything of value for the understanding or treatment of stuttering. Edit: you may be more interested in the comorbid health conditions for reasons other than ultimately treating stuttering, so on second thought my concerns may be unfounded if your goals are not to treat stuttering. Edit 2: I'm curious what you specifically mean by ''causes'' stuttering. If I stutter in a specific instance on the word, ''hello'' when I answer the phone, but not when I then say, ''how are you?'' what is ''causing'' stuttering in one second but not ''causing'' it in the following second that could be revealed by this type of research? Or, if I say ''hello?'' fluently two minutes later when I answer the phone, what 'caused' it the first time two minuted ago but not this time? I'm genuinely curious because this is not my area of expertise but it seems like you're staring straight at some theoretical and philosophical incompatibilities with the premise that stuttering has a 'cause' in the biology of the organism.