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| Lam R. J, 2013 [7] | |
| Selection | |
| Is the case definition adequate? | 1 |
| Representativeness of the cases | 1 |
| Selection of controls | 1 |
| Definition of controls | 1 |
| Comparability | |
| Study controls for (age) | 1 |
| Study controls for any additional factor | 1 |
| Exposure | |
| Ascertainment of exposure | 1 |
| The same method of ascertainment for cases and controls | 1 |
| Non-response rate | 0 |
| Total score | 8/9 |
| Quality of study | High |
