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Lee, Joseph C; Seiler, Jens; Blankstein, Ron; Padera, Robert F; Baughman, Kenneth L; Tedrow, Usha B (2009). Images in cardiovascular medicine. Cardiac sarcoidosis presenting as heart block. Circulation, 120(15), pp. 1550-1. Baltimore, Md.: Lippincott Williams & Wilkins 10.1161/CIRCULATIONAHA.109.872911