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Resp: respiratory; neuro: neurological
| Symptoms at presentation | No. of patients (%) |
| Respiratory symptoms | 6 (46.2) |
| Neurological symptoms | 2 (15.4) |
| Resp + neuro symptoms | 5 (38.5) |
| Respiratory acidosis | 7 (53.8) |
| Respiratory arrest | 3 (23.1) |
