Age as criterion
| Age | Authors |
|---|---|
| Predominantly young | Pearce (1990) |
| Between 15 and 29 years | Loker-Murphy and Pearce (1995) |
| Between 15 and 31 years | Adam (2015) |
| Between 18 and 33 years | Sørensen (2003) |
| Between 18 and 35 years | Pearce and Foster (2007) |
| Between 15 and 24 years | Hunter-Jones et al. (2008) |
| <40 years | Pearce et al. (2009) |
| >65 years | Chen et al. (2020) |
| Age | Authors |
|---|---|
| Predominantly young | |
| Between 15 and 29 years | |
| Between 15 and 31 years | |
| Between 18 and 33 years | |
| Between 18 and 35 years | |
| Between 15 and 24 years | |
| <40 years | |
| >65 years |
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