Adolescent, Adult, Angina Pectoris, Arm, Dyspnea, Ethnicity, Female, Health Education, Health Knowledge, Attitudes, Practice, Health Promotion, Humans, Hypesthesia, Male, Middle Aged, Minority Groups, Multivariate Analysis, Myocardial Infarction, Pain, Patient Acceptance of Health Care, Racial Groups, Social Class, Sweating, Thrombolytic Therapy, Time Factors, United States, White People