Figure 2. ECG delivery system between the hospital and patient’s home. (A) “One way”: The patient attached the device at the outpatient clinic. The ECG monitoring was performed during the scheduled period. After the long-term ECG monitoring, the patients sent the ECG device to the hospital by post. (B) “Two way”: The doctors or medical staff sent the ECG devices to the patients’ homes by post on the scheduled day. The patients put the device on at home. After the long-term ECG, the patients sent the devices back to the hospital by post. ECG, electrocardiogram.