Fig. 1From: Lidocaine for postoperative pain after cardiac surgery: a systematic reviewPreferred reporting items for systematic reviews and meta-analyses flow chart of the study selection process. Note: Reproduced from Moher D, Liberati A, Tetzlaff J, Altman DG, Group P. Preferred reporting items for systematic reviews and metaanalyses: the PRISMA statement. BMJ. 2009;339:b2535 [10]Back to article page