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

considerable latitude in determining the qualifications of an expert and its ruling will not be disturbed on appeal unless a manifest abuse of discretion [is] shown. [Citations.]" (People v. Bloyd (1987) 43 Cal.3d 333, 357.) "Discretion is abused when the court exceeds the bounds of reason, all of the circumstances being considered. [Citations.]" (People v. Bradford (1976) 17 Cal.3d 8, 20.)