Electrocardiographic Data
Each participant underwent 12 lead ECG after 10 minutes of resting in the supine position at 25 mm/s speed, with a 0.16–100 Hz filter range and 10 mm/mV height. Electrocardiographic examinations were analyzed by two independent cardiologists. ERP was defined according to the definition of Haissaguerre et al. It was evaluated as a J point elevation which has to be at least 0.1 mV above the isoelectric segment in at least 2 contiguous leads, as well as has the presence of QRS slurring or notching at the QRS terminal 1. Participants were divided into two groups according to the presence of ERP on the surface ECG: Group 1 was defined as individuals with ERP whereas Group 2 was defined as individuals without ERP. The inter-observer and intra-observer concordance rate for the presence of ERP were 98.5% and 98.9%, respectively.