1 School of Medicine, University of California-San Francisco, San Francisco, California, USA.
2 Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, University of California-San Francisco, San Francisco, California, USA.
3 Department of Medicine, University of California-San Francisco, San Francisco, California, USA; Cardiovascular Genetics Program, University of California-San Francisco, San Francisco, California, USA.
4 Department of Anatomic Pathology, University of California-San Francisco, San Francisco, California, USA.
5 Department of Anatomic Pathology, University of California-San Francisco, San Francisco, California, USA; Office of the Chief Medical Examiner, City and County of San Francisco, San Francisco, California, USA.
6 Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, University of California-San Francisco, San Francisco, California, USA. Electronic address: zhtseng@medicine.ucsf.edu.