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Harden KA, Cowan PA, Velasquez-Mieyer P, Patton SB.Harden KA, et al.J Am Acad Nurse Pract. 2007 Jul;19(7):368-77. doi: 10.1111/j.1745-7599.2007.00236.x.J Am Acad Nurse Pract. 2007.PMID: 17680902