In this recent review, Montague et al. cogently reviewed this emerging field. They lucidly described the current state and the future directions for the field. The article is publicly accessible in PMC. I am posting the link below.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3556822/pdf/nihms345286.pdf
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3556822/pdf/nihms345286.pdf