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heart failure heart failure study patient participant rotterdam chapter model systolic dysfunction diagnosis mortality population history death incidence disease rotterdam study value prognosis women table follow-up echocardiography function systolic function risk factors practice infarction presence systolic dysfunction heart failure patients prevalence survival factor subject person symptom research result hartfalen hypertension diabetes method score examination roc area netherland ratio heart failure score body mass index ejection fraction medication event characteristic addition trial european society information treatment management pressure group hospital health population-based blood fraction practitioner mosterd atrial grobbee index measurement wood da ejection increase echocardiographic diastolic