Is the 12-lead electrocardiogram of value in the prognostic assessment of patients with hypertrophic cardiomyopathy? by Udelson James E, Haas Tammy S, Lesser John R, Gibson C Michael R, Biller Leah, Buros Jacqueline L, Harrigan Caitlin, Appelbaum Evan, Rowin Ethan J, Manning Warren J, Maron Barry J, Maron Martin S