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Tough SC, Newburn-Cook CV, Faber AJ, White DE, Fraser-Lee NJ, Frick C.Tough SC, et al.Int J Health Care Qual Assur Inc Leadersh Health Serv. 2004;17(1):26-38. doi: 10.1108/09526860410515918.Int J Health Care Qual Assur Inc Leadersh Health Serv. 2004.PMID: 15046471