What is the test for credibility of an expert in a medical malpractice case?

But the triers of fact alone decide "the credibility of experts." (Biren v. Equality Emergency Medical Group, Inc. (2002) 102 Cal.App.4th 125, 139.) "[A] jury may entirely reject the testimony of a plaintiff's expert, even where the defendant does not call any opposing expert and the expert testimony is not

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contradicted." (Howard v. Owens Corning, supra, 72 Cal.App.4th at p. 633.)