Non-sedation versus sedation with a daily wake-up trial in critically ill patients recieving mechanical ventilation - effects on long-term cognitive function: Study protocol for a randomized controlled trial, a substudy of the NONSEDA trial

危重症机械通气患者非镇静与每日唤醒镇静试验——对长期认知功能的影响：一项随机对照试验的研究方案，NONSEDA试验的子研究