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| Study ID | Reason for exclusion |
| Anderson 1982 | Paediatric hospital |
| Buemi 1995 | Study design; outcomes |
| Cheek 1971 | Qualitative |
| Hewawasam 1996 | Study design |
| Hussian 1987 | Study design |
| Skoutelis 1993 | Study design |
| Thorne 1963 | Qualitative evaluation |
