| Study | Reason for exclusion |
|---|---|
| Dusdieker 1985 | The study utilised a cross‐over design. |
| Dusdieker 1986 | The study utilised a cross‐over design. |
| Dusdieker 1990 | The study utilised a cross‐over design. |
| Morse 1992 | The study utilised a cross‐over design. |
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