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. 2007 Apr 24;6:3. doi: 10.1186/1475-9292-6-3

Figure 4.

Figure 4

Analyses of published clinical trials involving CL. Of 75 studies only 20 were randomized, control trial (RCT), double blind (DB) with placebo control (PC). There were 27 trials that had no control arm. For a self healing disease, a control arm is necessary if it is ethically correct. There is a need to improve the quality of clinical trials.