Except in preliminary hearings conducted under Kan. Stat. Ann. §§ 44-534a and amendments thereto, no report of any examination of any employee by a health care provider, as provided for in the workers compensation act and no certificate issued or given by the health care provider making such examination, shall be competent evidence in any proceeding for the determining or collection of compensation unless supported by the testimony of such health care provider, if this testimony is admissible, and shall not be competent evidence in any case where testimony of such health care provider is not admissible.