SLC5A2 and heart failure: 6MWTD: 6-minute walk test distance; GLP-1: glucagon-like peptide-1; HFpEF: heart failure with preserved ejection fraction; HFrEF: heart failure with reduced ejection fraction; KCCQ: Kansas City Cardiomyopathy Questionnaire; SGLT-2: sodium-glucose cotransporter-2