1 Center of Excellence in Arrhythmia Research Chulalongkorn University, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
2 Center of Excellence in Arrhythmia Research Chulalongkorn University, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand; Bumrungrad Hospital, Bangkok and Pacific Rim Electrophysiology Research Institute, Bangkok, Thailand, and Las Vegas, Nevada. Electronic address: wee@pacificrimep.com.