作者单位:Univ Missouri, Div Cardiovasc Med, One Hosp Dr,CE 306, Columbia, MO 65212 USA[1]Med Univ South Carolina, Div Cardiol Electrophysiol, 114 Doughty St MSC 592, Charleston, SC 29425[2]Univ Missouri, Div Dept Internal Med, One Hosp Dr,MA432, Columbia, MO 65212 USA[3]