摘要：The Publisher regrets that this article is an accidental duplication of an article that has already been published in Procedia - Social and Behavioral Sciences Volume 191 (2015): Pages 662- 667,http://dx.doi.org/10.1016/j.sbspro.2015.04.636. The duplicate article has therefore been withdrawn.The full Elsevier Policy on Article Withdrawal can be found athttp://www.elsevier.com/locate/withdrawalpolicy
