What is the "substantial evidence" standard of review in medical malpractice cases?

"Under the substantial evidence standard of review, we review the entire record to determine whether there is substantial evidence supporting the [trier of fact's] factual determinations [citation], viewing the evidence and resolving all evidentiary conflicts in favor of the prevailing party and indulging all reasonable inferences to uphold the judgment [citation]. The issue is not whether there is evidence in the record to support a different finding, but whether there is some evidence that, if believed, would support the findings of the trier of fact. [Citation.] Credibility is an issue of fact for the trier of fact to resolve [citation], and the testimony of a single witness, even a party, is sufficient to provide substantial evidence to support a factual finding [citation]." (Fariba v. Dealer Services Corp. (2009) 178 Cal.App.4th 156, 170-171.)