Ключевые слова: 911, ache, aged, ambulance call, anxious, attack, breast, call, call emergency, cardiac, cardio, cardiology, cardiovascular, caucasian, cellphone, chest, chest pain, cramp, disease, elderly, emergency, healthcare and medicine, heart, heart attack, heart disease, heart pain, heartache, illness, lose consciousness, male, man, medicine, old, outdoors, pain, pensioner, people, person, problem, retirement, senior, senior adult, senior men, sick, stroke, suffer, troubled, unhealthy, worried,