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Published online 2008 Sep 12. doi:  10.1186/1746-1340-16-11

Table 3

Level of evidence

Level of evidence# of studies
2004–2007
# of studies
up to 2003
total # studies
to June 2007
systematic reviews112
RCT's1910
Observational213
Descriptive36141177
Conference abstracts171431
 RCT055
 OBSERV101
 DESC16925
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