Research Links.

http://virtualmentor.ama-assn.org//2010/08/jdsc1-1008.html

http://eje-online.org/content/161/5/795.long

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3665407/

http://www.ncbi.nlm.nih.gov/pubmed/22013611

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3722435/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3703755/

http://files.eric.ed.gov/fulltext/ED500474.pdf

I would love to read this but it a PAY site http://www.tandfonline.com/doi/abs/10.1300/J461v02n03_06#.UupMaHnnnHg

PAY site http://onlinelibrary.wiley.com/doi/10.1521/suli.2007.37.5.527/abstract

PAY    http://www.tandfonline.com/doi/full/10.1080/19359700903165357#.UupNB3nnnHg

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3877116/

http://www.sciencedirect.com/science/article/pii/S0091302211000252

http://www.ncbi.nlm.nih.gov/pubmed/22508080

http://www.ncbi.nlm.nih.gov/pubmed/21266549

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3312187/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3114100/

http://eje-online.org/content/164/4/635.long

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3896415/

http://cercor.oxfordjournals.org/content/23/12/2855.long

WANT! http://onlinelibrary.wiley.com/doi/10.1111/j.1752-0606.2011.00283.x/full

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2913672/