{Reference Type}: Letter {Title}: Comment on "efficacy and safety of ketamine as an adjuvant to regional anesthesia: A systematic review and meta-analysis of randomized controlled trials". {Author}: Wan Z;Huang D; {Journal}: J Clin Anesth {Volume}: 96 {Issue}: 0 {Year}: 2024 Sep 28 {Factor}: 9.375 {DOI}: 10.1016/j.jclinane.2024.111492