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Goldfien RD, Ng MS, Yip G, Hwe A, Jacobson A, Pressman A, Avins AL.Goldfien RD, et al.BMJ Open. 2014 Jan 10;4(1):e003627. doi: 10.1136/bmjopen-2013-003627.BMJ Open. 2014.PMID: 24413343Free PMC article.