| | No. of studies | Study ID no. |
| Date of publication | | | 2001–2005 | 4 | 16, 32, 35, 41 | 2006–2011 | 13 | 28, 29, 30, 31, 33, 34, 36, 37, 38, 39, 40 | Study sites | | | US | 1 | 33 | China and Hong Kong | 11 | 28, 29, 30, 31, 32, 36, 37, 40, 41 | Others (Sweden, Australia, Korea) | 5 | 16, 34, 35, 38, 39 | Language of study | | | Chinese | 6 | 28, 29, 30, 31, 36, 37 | English | 11 | 16, 32, 33, 34, 35, 38, 39, 40, 41 | Clinical domains | | | Chronic physical illnesses | 1 | 41 | Cancer | 1 | 38 | Depression | 1 | 40 | Type II diabetes | 4 | 28, 30, 31, 36 | Hypertension | 2 | 16, 32 | No medical condition | 8 | 29, 33, 34, 35, 37, 39 |
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