Viandy, Vincent, <p><span lang="EN-US">Department of Anesthesiology &amp; Intensive</span><span lang="EN-US"> </span><span lang="EN-US">Care, Faculty of Medicine, Universitas</span><span lang="EN-US"> </span><span lang="EN-US">Sumatera Utara</span></p><p><span lang="EN-US, Indonesia