***TASK***
the task is to simplify the input abstract of a biomedical literature

***INPUT***
the input is the abstract of a biomedical literature

***OUTPUT***
the output is the simplified abstract for the input abstract of a biomedical literature

***DOCUMENTATION***

***EXAMPLES***

Input: We found17 studies involving 3212 patients. The methods of 15 studies were at high risk of bias. In only two studies was the risk of bias low. Trials used "positive drugs", of which the efficacy was not known, as controls. Different Chinese herbal preparations were tested in nearly all trials. In only one trial was a Chinese herbal preparation tested twice. In seven trials, six herbal preparations were found to be more effective at enhancing recovery than the control preparations. In the other 10 studies, seven herbal preparations were not shown to be significantly different from the control. One study did not describe the difference between the intervention and control groups. Chinese herbal medicines may shorten the symptomatic phase in patients with the common cold. However, the lack of trials of low enough risk of bias, or using a placebo or a drug clearly identified as a control, means that we are uncertain enough to be unable to recommend any kind of Chinese medicinal herbs for the common cold.
Output:

Although we included 17 trials, involving 3212 patients, in this review, the risk of bias was so high that the evidence did not support using any Chinese herbal preparation(s) for the common cold. Well-designed clinical trials are required.