[1] UNIV PENN,PRESBYTERIAN MED CTR,PHILADELPHIA HEART INST,39TH & MARKET ST,PHILADELPHIA,PA 19102
[2] HAHNEMANN UNIV,LIKOFF CARDIOVASC INST,DIV CLIN CARDIAC ELECTROPHYSIOL,PHILADELPHIA,PA 19102
[3] HAHNEMANN UNIV,LIKOFF CARDIOVASC INST,CTR COMP,PHILADELPHIA,PA 19102