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Study No. of patients Protocol Findings Elharrar et al6 24 As tolerated, majority > 3 hours Oxygenation improvement in a subset of patients Sartini et al7 15 Noninvasive ventilation in addition to proning for median of 2 times, 3 hours each per day Improved oxygenation Ng et al8 10 1 hour each, 5 sessions a day, spaced 3 hours apart Improved oxygenation and reduced need for mechanical ventilation Caputo et al9 50 5 minutes of proning Improvement in oxygenation with proning