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'[A] physician who has acquired knowledge of a patient or of specific facts in connection with a patient may be called upon to testify to those facts without any compensation other than the ordinary witness receives for attendance upon court.' (McClenahan v. Keyes, 188 Cal. 574, 583 [206 P. 454]; see, also, People v. Barnes, 111 Cal.App. 605, 610 [295 P. 1045]; People v. Conte, 17 Cal.App. 771, 784 [122 P. 450, 457]; Ex Parte Dement, 53 Ala. 389 [25 Am.Rep. 611]; Dixon v. People, 168 Ill. 179 [48 N.E. 108, 39 L.R.A. 116]; Summers v. State, 5 Tex.App. 365 [32 Am.Rep. 573]; ...