NYHA class I heart failure is not 'mild'.
Witte
Klaus K
KK
Clark
Andrew L
AL
D002908:Chronic Disease; D015331:Cohort Studies; D005080:Exercise Test / Q000379:methods; D006333:Heart Failure / Q000145:classification* / Q000473:pathology*; D006801:Humans; D012720:Severity of Illness Index