Baseline comorbidities recorded on register questionnaire
| Hypertension |
| Ischaemic heart disease (angina pectoris and/or myocardial infarction) |
| Asthma |
| Chronic obstructive pulmonary disease |
| Pulmonary fibrosis |
| Renal disease |
| Liver disease |
| Peptic ulcer disease |
| Thyroid disease |
| Depression |
| Cerebrovascular accident |
| Demyelinating disease |
| Epilepsy |
| Diabetes |
| Tuberculosis |
| Malignancy |