Effect of the Red Bull Energy Drink on Perfusion-Related Variables in Women Undergoing Microsurgical Breast Reconstruction: Protocol and Analysis Plan for a Prospective, Multicenter Randomized Controlled Trial

红牛能量饮料对接受显微外科乳房重建术女性灌注相关变量的影响：一项前瞻性、多中心随机对照试验的方案和分析计划