The study design is a two-diet, two-period, two-sequence, randomized, open label and cross-over with 1-week diet-washout and 2-weeks drug-washout interval. The participants (n=16) are randomly assigned to either of 7 days of low sodium (50 mmol/day) or high sodium diet (300 mol) after hospitalization. After completion of 7-days of first period, all participants are discharge and recommended to eat usual diet. After 1-week of diet washout, all participants are hospitalized for second period. The compliance of diet is determined by measurement of 24-hour urine sodium excretion. The 24-hour urine sodium excretion should be < 100 mmol/24-hour in the low sodium diet period and > 200 mmol/24-hour in high sodium diet period.