Okla. Stat. tit. 85, Rule 20
A. Expert medical testimony may be offered by:
B. The Workers' Compensation Court, recognizing that it is costly and time-consuming to have physicians appear at trial to testify, encourages the production of medical evidence by verified or declared written medical reports. The Court encourages but does not require the report to include the following information, as applicable:
Adopted by order of the Supreme Court,