You will be shown the abstract of a medical clinical trial report. Your task is to extract all the findings from this report into a JSON array. Each finding should contain the following five elements:

- Intervention: The medical intervention being tested. This should be a text span copied from the input passage.
- Comparator: The baseline against which the intervention is being evaluated. This should be a text span copied from the input passage. If no comparator is reported, set to `null`.
- Outcome: The medical outcome whose effect is being measured. This should be a text span copied from the input passage.
- Effect: The effect of the intervention on the outcome, relative to the comparator. The effect should be one of the following three values: ("significantly increased", "significantly decreased", "no significant difference").
- Evidence: The evidence for the effect. This should be a text span copied from the input passage.

Please format your output as a JSON array. Each entry in the output should be an array containing the 5 elements listed above, in the following order: [<intervention>, <comparator>, <outcome>, <effect>, <evidence>].

For example, an output with two findings might read:
```
[["aspirin", "placebo", "headache severity", "significantly decreased", "Mean headache severity was significantly decreased in the aspirin group compared to the placebo group (p < 0.05)."], ["aspirin", "placebo", "weight loss", "no significant difference", "We did not observe any difference in weight loss between the group given aspirin relative to the control group"]]
```

There are 4 finding(s) in the abstract below. Please extract them. Output only the JSON array with these 4 findings. Do not include any additional text.

Abstract:
ABSTRACT: Recently some have
called for randomized controlled trials
comparing RFA to hepatic resection, particularly
for patients with only a few small metastases.
The objectives were to compare local
recurrence and survival following RFA and
hepatic resection for colorectal liver
metastases. This was a retrospective review of
open RFA and hepatic resection for colorectal
liver metastases between January 1998 and May
2007. All patients who had RFA were considered
to have unresectable disease. 58 patients had
hepatic resection and 43 had RFA. A 5-year
survival after resection was 43% compared to
23% after RFA. For patients with solitary
lesions, a 5-year survival was 48% after
resection and 15% after RFA. Sixty percent
of patients suffered local recurrences after RFA
compared to 7% after hepatic resection. RFA
is inferior to resection. The results observed
in this study support the consensus that RFA
cannot be considered an equivalent procedure to
hepatic resection.

Findings:
[["Radiofrequency ablation", "Hepatic resection", "Local recurrence rate through the study", "significantly increased", "Sixty percent\r\r\r\r\nof patients suffered local recurrences after RFA\r\r\r\r\ncompared to 7% after hepatic resection. "], ["Radiofrequency ablation", "Hepatic resection", "Need for ICU ", "no significant difference", "Rates of ICU admission (6.5% of patients overall), and length of stay (median of 7 days for all patients; range 1 to 48) were not significantly different between patients having hepatic resection and RFA."], ["Radiofrequency ablation", "Hepatic resection", "Duration of surgery", "significantly decreased", "The operative time was significantly longer for the resection group compared to the RFA group (median of 269 minutes (range 118 to 452) versus 204 minutes (range 113 to 316); P \u003c .0005)."], ["Radiofrequency ablation", "Hepatic resection", "Transfusion requirements", "significantly decreased", "Operative blood loss (median 1400 mL (range 100 to 9000) versus 150 mL (range 50 to 2300); P \u003c .0005) and transfusion requirements (44% of patients versus 5%; P \u003c .0005) were higher for resection than for RFA."]]