Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Otto CM,ACC/AHA guideline for the Management of Patients with Valvular Heart Disease: a report of the American College of Cardiology/American Heart Association joint committee on clinical practice guidelines,Circulation,,,2020,2021,,143,https://cir.nii.ac.jp/crid/1370861707131904006,