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Cruz-Aceves I, Avina-Cervantes JG, Lopez-Hernandez JM, Garcia-Hernandez MG, Ibarra-Manzano MA.Cruz-Aceves I, et al.Comput Math Methods Med. 2013;2013:909625. doi: 10.1155/2013/909625. Epub 2013 Oct 2.Comput Math Methods Med. 2013.PMID: 24198850Free PMC article.