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Published online by Cambridge University Press: 02 January 2018
The importance of tracing technique and persistence was stressed by Sims. Long-term follow-up studies help to complete the clinical picture, a phrase used by Morris. They also help to clarify such issues as the effectiveness of treatment methods and changes in the socio-demographic status of patients. Unless a high percentage of the follow-up group is effectively traced, then the results of a long-term follow-up study must be suspect.
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