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