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Procalcitonin-guided antibiotic use versus a standard approach for acute respiratory tract infections in primary care: study protocol for a randomised controlled trial and baseline characteristics of participating general practitioners [ISRCTN73182671]
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* Corresponding author: Matthias Briel brielm@uhbs.ch
BMC Family Practice 2005, 6:34 doi:10.1186/1471-2296-6-34