The links I posted earlier don't seem to be working now and I can't edit my post. Here are some more links about hormonal imbalance and neuroendocrine dysfunction after concussion:

http://www.scientificamerican.com/ar...ne-deficiency/

http://w.jwci.org/uploadedFiles/Home...ituitarism.pdf

http://www.dcoe.mil/content/Navigati...ing_Slides.pdf

http://tbi-research.org/12hormone.pdf

http://www.tbi-research.org/neurotrauma09kreber.pdf

If you start looking, you can fond dozens and dozens of articles about growth hormone deficiency, neuroendocrine dysfunction, hypopituitarism and post-traumatic hypopituitarism caused by mTBI if you start Googling them. This seems to be what a lot of experts are researching these days. I suspect in the next 10 years or so, that a lot more information will be gained about this subject, and that will include changing the hormone levels that are considered "normal" or average so that more people can be treated. There also seems to be some discrepancies among experts opinions concerning different gender needs of GH.