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Methodological issues present in included reviews.
| Methodological | No. of reviews | References |
|---|---|---|
| Included studies primarily conducted in China | 17 | Previous studies (15, 25–29, 34–39, 43–47), |
| Included studies clearly describe diagnosis of cancer pain | 3 | Previous studies (25, 36, 41) |
| Included studies clearly describe the type of cancer | 2 | Previous studies (28, 46) |
| Included studies clearly describe the adverse events and the number of patients | 2 | Previous studies (25, 29) |
