***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: Seventeen studies with a total of 3898 participants were analysed. One studied fibrin sealant, and the other 16 studied HA. No evidence was found of a treatment effect of fibrin sealant as an adherence compound. For HA, evidence of a positive treatment effect was identified in the six trials that reported live birth rates (odds ratio (OR) 1.41, 95% confidence interval (CI) 1.17 to 1.69; six RCTs, N = 1950, I2 = 0%, moderate-quality evidence). Furthermore, the 14 trials reporting clinical pregnancy rates showed evidence of treatment benefit when embryos were transferred in media containing functional concentrations of HA (OR 1.39, 95% CI 1.21 to 1.60; 14 RCTs, N = 3452, I2 = 46%, moderate-quality evidence) as compared with low or no use of HA. The multiple pregnancy rate (OR 1.86, 95% CI 1.49 to 2.31; five RCTs, N = 1951, I2 = 0%, moderate-quality evidence) was significantly increased in the high HA group, but no significant differences in adverse event rates were found (OR 0.74, 95% CI 0.49 to 1.12; four RCTs, N = 1525, I2 = 0%, moderate-quality evidence). Evidence suggests improved clinical pregnancy and live birth rates with the use of functional concentrations of HA as an adherence compound in ART cycles. However, the evidence obtained is of moderate quality. The increase in multiple pregnancy rate may be the result of use of a combination of an adherence compound and a policy of transferring more than one embryo. Further studies of adherence compounds with single embryo transfer need to be undertaken.
Output:

Seventeen randomised controlled trials (3898 participants) were included in the review. One studied fibrin sealant, and the other 16 studied HA. Investigators compared embryo transfer in a medium containing high versus low or no hyaluronic acid and in a medium containing fibrin sealant versus transfer in a medium with no fibrin sealant. Outcomes reported included live birth rates, clinical pregnancy rates, implantation rates, multiple pregnancy rates and other adverse events. The mean age of the women ranged from 27.5 to 35.7 years. The evidence gathered is current to November 2013. Analysis of the 16 studies that were identified using functional concentrations of HA showed an increase in the chances of pregnancy and live birth (450 vs 367 per 1000) but also an increase in the chance of the more risky outcome of multiple pregnancy (282 vs 175 per 1000). This increase in multiple pregnancy rate may be the result of improved pregnancy outcomes due to the addition of the adherence compound and the policy of transferring more than one embryo back into the uterus. Evidence obtained for these comparisons was of moderate quality. It is important to note that evidence of a higher delivery rate was not found in all analyses; however, it was found in the overall meta-analysis. Based on the single identified study that used fibrin sealant, no evidence indicates that the addition of this compound to an embryo transfer medium improved pregnancy outcomes.