BMC Emerg Med. 2017 Aug 29;17(1):25. doi: 10.1186/s12873-017-0138-1.
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Stop Antibiotics on guidance of Procalcitonin Study (SAPS): a randomised prospective multicenter investigator-initiated trial to analyse whether daily measurements of procalcitonin versus a standard-of-care approach can safely shorten antibiotic duration in intensive care unit patients--calculated sample size: 1816 patients.