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http://www.sciencedirect.com/science/article/pii/S0963996911006685
http://pubs.rsc.org/en/Content/ArticleLanding/2014/FO/c4fo00258j#!divAbstract
http://informahealthcare.com/doi/abs/10.3109/09637486.2013.832173
http://www.sciencedirect.com/science/article/pii/S0278691513002688