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Blood glucose levels (mean or median in the control or conventional group (closed bars) and strict glycemic control group (open bars) of seven randomized controlled trials. Original single-center randomized controlled trials (RCTs) from Leuven [1,2]; single-center RCTs [3,4]; multi-center RCTs [5-7]. Dotted lines indicate the blood glucose levels in the two original single-center RCTs from Leuven.
