NPPB and heart failure: Adjusted for age, sex, and race or ethnicity, study site (only in MESA), education, height, BMI, smoking status, alcohol drinking, physical activity, systolic and diastolic blood pressure, use of antihypertensive medication, diabetes, C‐reactive protein, and loge (NT‐proBNP) (in MESA) or loge(BNP) (in the FHS),incident myocardial infarction and incident heart failure as time‐dependent covariates