What is the test for expert testimony in a medical malpractice case?

"The requirements for expert testimony are that it relate to a subject sufficiently beyond common experience as to assist the trier of fact and be based on matter that is reasonably relied upon by an expert in forming an opinion on the subject to which his or her testimony relates. [Citations.] Such evidence is admissible even though it encompasses the ultimate issue in the case." (People v. Olguin (1994) 31 Cal.App.4th 1355, 1371.)

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