Patients in the telemonitoring group received a training session during which they were instructed on how to use the monitoring system and how to perform measurements in case of symptoms. At the end of the session correct comprehension of the system functioning was tested for each patient. A study physician was available on call during office hours to assist patients needing further instructions. A technician was also available in order to solve ingoing hardware malfunctioning. Participants unable to properly use the kit were excluded from the study.