| Study | Reason for exclusion |
|---|---|
| Christensen 2006 | Pilot study, no control group enrolled |
| Christensen 2007 | Non‐random allocation |
| Lakatos 1980 | Retrospective analysis of historical cohort (preliminary report) |
| Lakatos 1982a | Retrospective analysis of historical cohort |
| Lakatos 1982b | Review article |
| Lakatos 1982c | Retrospective analysis of historical cohort |
| Lakatos 1982d | Letter to the editor |
| Lakatos 1985 | Description of retrospective cohorts enrolled over the years 1974 to 1978, 1979 to 1980, 1981 to 1982. |
| Lakatos 1988 | Correspondence to editor referring to the included trials |
| Lakatos 1989 | Review article referring to previous studies |
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