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Demographic data of healthy volunteers
| Characteristics | Healthy volunteers |
| Age (y) | 44.53±14.5 |
| Sex (male/female) | 15/30 |
| Number of 20- to 29-year-old subjects | 9 |
| Number of 30- to 39-year-old subjects | 9 |
| Number of 40- to 49-year-old subjects | 9 |
| Number of 50- to 59-year-old subjects | 9 |
| Number of 60- to 69-year-old subjects | 9 |
Values are the means±the standard deviations.
