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...Core metadata citation and similar papers at ac uk provided by elsevier publisher connector volume number value in health data collection methods prospective economic evaluations how accurate are the results christopher j evans phd bruce crawford ma mapi values boston abstract objectives often a division is nature misleading as strategy can lead made between those studies that have high level of to different resource cost estimates even when all curacy versus easily generalized this other relevant factors it possible shift terstudy dichotomy translated into improve validity combining randomized controlled trials with internal observational modeling conclusions instead viewing external va article challenges lidity polar opposites should be considered conventional view examines intrastudy effects on terms continuum within particular study use proxies collect utilization re method review summary literature was liance patient self reported conducted order assess impact collec collecting ty...