Sentence examples for procedure has been challenged from inspiring English sources

However, even the effectiveness of this procedure has been challenged in patients suffering cardiac arrest not related to ventricular fibillation [ 15, 16].

A fundamental physical process has been challenged".

But the process had been challenging.

According to ancient sources, whose veracity has been challenged, the procedure takes its name from a branch of the ancient Roman family of the Julii whose cognomen, Caesar (Latin caedere, "to cut"), originated from a birth by this means.

However, this procedure has associated costs and potential complications, and its utility in VAP has been challenged.

Also, the reliability of CMSOS has been challenged due to the lack of standardization in the assessment procedures [ 8, 30].

It has been challenged by other witnessess.

But lately that assumption has been challenged.

Carr's argument has been challenged.

This has been challenged, too.

Still, it has been challenged.