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| Etiology | Idiopathic | Infective | Immune-mediated | Masquerade | ||||
| Number of patients (n, %) | 36 | 14 | 14 | 2 | ||||
| Gender | ||||||||
| Male | 15 | (41.7) | 6 | (42.9) | 9 | (64.3) | 0 | (0.0) |
| Female | 21 | (58.3) | 8 | (57.1) | 5 | (35.7) | 2 | (100.0) |
| Race | ||||||||
| Chinese | 23 | (63.9) | 6 | (42.9) | 8 | (57.1) | 1 | (50.0) |
| Malay | 3 | (8.3) | 4 | (28.6) | 3 | (21.4) | 1 | (50.0) |
| Asian Indians | 7 | (19.4) | 2 | (14.3) | 3 | (21.4) | 0 | (0.0) |
| Others | 3 | (8.3) | 2 | (14.3) | 0 | (0.0) | 0 | (0.0) |
| Laterality | ||||||||
| Bilateral | 21 | (58.3) | 6 | (42.9) | 10 | (71.4) | 0 | (0.0) |
