- Clinical competence in invasive cardiac electrophysiological studies. A statement for physicians from the ACP/ACC/AHA Task Force on Clinical Privileges in Cardiology. Akhtar, M., Williams, S.V., Achord, J.L., Reynolds, W.A., Fisch, C., Friesinger, G.C., Klocke, F.J., Ryan, T.J., Schlant, R.C. Circulation (1994)