 Registry to Enable Prospective Safety Study DISCOVER-HCM to Track Long-Term Safety and Effectiveness of Mavacamten in Patients with Symptomatic, Obstructive Hypertrophic Cardiomyopathy Registry to Enable Prospective Safety Study DISCOVER-HCM to Track Long-Term Safety and Effectiveness of Mavacamten in Patients with Symptomatic, Obstructive Hypertrophic Cardiomyopathy 