NPPB and hydrops fetalis: Age, caregiver at Swede HF registration, specialty at Swede HF registration, follow-up referral specialty (physician specialty; not same as the HF nurse FUP), follow-up referral to outpatient HF nurse clinic, NYHA, BMI, blood pressure (SBP, DBP), heart rate, eGFR, NT-pro BNP, RAS inhibitors, MRA, digoxin, diuretic, nitrate, platelet inhibitor, oral anticoagulant, statin, beta-blocker, ICD and/or CRT, smoking, HP, DM, IHD, coronary revascularization, peripheral artery disease, severe bleeding, valve disease, anemia, cancer history, family type, education, income, number of children