References
  1. Josephson ME. Clinical Cardiac Electrophysiology. 4th ed. Philadelphia: Lippincott Williams & Wilkins, 2008: 175 –226.
  2. Issa ZF, Miller JM, Zipes DP. Clinical Arrhythmology and Electrophysiology. Philadelphia: Saunders Elsevier, 2009: 293 –311.