Approximately half of the patients will receive an ICM. All patients will be followed for 36 months. It is expected that the enrollment phase will last 1 year, and that the total study duration will be 4 years. The study is expected to end in 2017. One hundred and two patients are needed for 95% confidence level and 80% statistical power to be randomized into the study, at approximately 5 centers in Latin America. Patients will be considered enrolled once they have signed the Informed Consent. The following additional parameters will also be collected: