Ключевые слова: 2020, background, beat, black, blood, cardiologist, cardiology, care, color, composition, concept, consultation, copy, dark, diagnosis, disease, doctor, documents, examination, eyeglasses, figure, flat, health, heart, heartbeat, illness, lay, medic, medical, medicine, new, nobody, number, object, patient, pressure, prevention, pulse, rhythm, service, sickness, space, stethoscope, text, top, treatment, view, year,