https://compendium.com.ua/clinical-guidelines/cardiology/section-15/glava-2-standarty-diagnostikii-lecheniya-zabolevanij-serdechno-sosudistoj-sistemy/13-klinicheskij-protokol-predostavleniya-medpomoshhi-bolnym-s-hronicheskoj-revmaticheskoj-boleznyu-serdtsa-porokami-serdtsa/