http://www.nature.com/bjc/journal/v109/n11/full/bjc2013510a....
http://www.sciencedirect.com/science/article/pii/S0753332213...
http://www.sciencedirect.com/science/article/pii/S0753332212...
http://www.nature.com/bjc/journal/v109/n11/full/bjc2013510a....
http://www.sciencedirect.com/science/article/pii/S0753332213...
http://www.sciencedirect.com/science/article/pii/S0753332212...