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Differences in the baseline characteristics.
| Success group | Failure group | P value | |
| Age (y) (mean ± s.d.) | 50 ± 11.47 | 46 + 10.90 | .085 |
| Gender (male/female) | 18/14 | 22/61 | .003 |
| BMI (body mass index) | 23.05 ± 2.83 | 22.46 ± 2.86 | .322 |
| Minorities | |||
| The Han nationality | 32 | 82 | 1.0 |
| Others | 0 | 1 | |
| Other diseases | |||
| Diabetes | 0 | 0 | 1.0 |
| Hypertension | 2 | 2 | |
| Others | 0 | 1 | |
