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Yes, recurrence has long been the primary barometer of success, they note…but of course recently chronic pain has become more widely acknowledged, especially the apparent underestimation of its prevalence.
That is disappointing to hear if the follow-up process is so tedious that it is discouraging participation. As it is, most long-term studies suffer from much participant attrition…every effort should be made to make it as simple and convenient as possible to keep people involved.