In a meta-analysis of splenic embolization for splenic trauma, randomized controlled trials found what (PMID: 21217497)? (poll 8076440)

In a meta-analysis of splenic embolization for splenic trauma, randomized controlled trials found what (PMID: 21217497)?

Embolization is better than observation for low grade trauma.

Embolization is better than splenectomy for high grade trauma.

Embolization is better for all grades.

There are no randomized controlled trials.

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