***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 found nine trials with 855 participants that randomised participants to fewer-than-four-ports laparoscopic cholecystectomy (n = 427) versus four-port laparoscopic cholecystectomy (n = 428). Most trials included low anaesthetic risk participants undergoing elective laparoscopic cholecystectomy. Seven of the nine trials used a single port laparoscopic cholecystectomy and the remaining two trials used three-port laparoscopic cholecystectomy as the experimental intervention. Only one trial including 70 participants had low risk of bias. Fewer-than-four-ports laparoscopic cholecystectomy could be completed successfully in more than 90% of participants in most trials. The remaining participants were mostly converted to four-port laparoscopic cholecystectomy but some participants had to undergo open cholecystectomy. There was no mortality in either group in the seven trials that reported mortality (318 participants in fewer-than-four-ports laparoscopic cholecystectomy group and 316 participants in four-port laparoscopic cholecystectomy group). The proportion of participants with serious adverse events was low in both treatment groups and the estimated RR was compatible with a reduction and substantial increased risk with the fewer-than-four-ports group (6/318 (1.9%)) and four-port laparoscopic cholecystectomy group (0/316 (0%)) (RR 3.93; 95% CI 0.86 to 18.04; 7 trials; 634 participants; very low quality evidence). The estimated difference in the quality of life (measured between 10 and 30 days) was imprecise (standardised mean difference (SMD) 0.18; 95% CI -0.05 to 0.42; 4 trials; 510 participants; very low quality evidence), as was the proportion of participants in whom the laparoscopic cholecystectomy had to be converted to open cholecystectomy between the groups (fewer-than-four ports 3/289 (adjusted proportion 1.2%) versus four port: 5/292 (1.7%); RR 0.68; 95% CI 0.19 to 2.35; 5 trials; 581 participants; very low quality evidence). The fewer-than-four-ports laparoscopic cholecystectomy took 14 minutes longer to complete (MD 14.44 minutes; 95% CI 5.95 to 22.93; 9 trials; 855 participants; very low quality evidence). There was no clear difference in hospital stay between the groups (MD -0.01 days; 95% CI -0.28 to 0.26; 6 trials; 731 participants) or in the proportion of participants discharged as day surgery (RR 0.92; 95% CI 0.70 to 1.22; 1 trial; 50 participants; very low quality evidence) between the two groups. The times taken to return to normal activity and work were shorter by two days in the fewer-than-four-ports group compared with four-port laparoscopic cholecystectomy (return to normal activity: MD -1.20 days; 95% CI -1.58 to -0.81; 2 trials; 325 participants; very low quality evidence; return to work: MD -2.00 days; 95% CI -3.31 to -0.69; 1 trial; 150 participants; very low quality evidence). There was no significant difference in cosmesis scores at 6 to 12 months between the two groups (SMD 0.37; 95% CI -0.10 to 0.84; 2 trials; 317 participants; very low quality evidence). There is very low quality evidence that is insufficient to determine whether there is any significant clinical benefit in using fewer-than-four-ports laparoscopic cholecystectomy compared with four-port laparoscopic cholecystectomy. The safety profile of using fewer-than-four ports is yet to be established and fewer-than-four-ports laparoscopic cholecystectomy should be reserved for well-designed randomised clinical trials.
Output:

We identified nine trials that compared fewer-than-four-ports laparoscopic cholecystectomy with four-port laparoscopic cholecystectomy. In these nine studies, 855 participants were included. Four hundred and twenty seven participants underwent fewer-than-four-ports laparoscopic cholecystectomy while the remaining 428 participants underwent four-port laparoscopic cholecystectomy. The choice of the treatment that the participants received was determined by a method similar to toss of a coin so that the two treatments were given to participants with similar characteristics. Most of these studies included low anaesthetic risk patients undergoing planned laparoscopic cholecystectomy. Fewer-than-four-ports laparoscopic cholecystectomy could be completed successfully in more than 90% of participants in most of the trials. The remaining participants were mostly converted to four-port laparoscopic cholecystectomy but some participants had to undergo open cholecystectomy (through a large incision in the abdomen). There was no mortality in either group in the seven trials that reported mortality (634 participants in the two groups). There was no significant difference in the proportion of participants who developed serious complications, quality of life between 10 and 30 days after operation, proportion of participants in whom the laparoscopic operation had to be converted to open cholecystectomy, or in the length of hospital stay between the groups. Fewer-than-four-ports laparoscopic cholecystectomy took about 15 minutes longer to complete than four-port laparoscopic cholecystectomy. The time taken to return to normal activity was one day shorter and time taken to return to work two days shorter in the fewer-than-four-ports group compared with four-port laparoscopic cholecystectomy. There was no significant difference in the cosmetic appearance between the two groups at 6 to 12 months after surgery. There appears to be no advantage of fewer-than-four-ports laparoscopic cholecystectomy in terms of decreasing surgical complications, hospital stay, or in improving quality of life and cosmetic appearance. In contrast, the safety of fewer-than-four port laparoscopic cholecystectomy is yet to be established. Fewer-than-four-ports laparoscopic cholecystectomy cannot be recommended routinely outside well-designed clinical trials. Most of the trials were of high risk of bias, that is, there is possibility of arriving at wrong conclusions because of the way that the trial was conducted. The overall quality of evidence was very low. Further well-designed randomised clinical trials (which have low probability to arrive at wrong conclusions because of chance and because of participant or researcher prejudice) are necessary to determine whether fewer-than-four-ports laparoscopic cholecystectomy is safe and whether there is any advantage of fewer-than-four-ports laparoscopic cholecystectomy over four-port laparoscopic cholecystectomy.