The fees and expenses of the medical board shall be charged in accordance with a schedule adopted by the commission upon the advice and recommendations of the medical advisory panel and such fees and expenses, along with such clinical and X-ray expenses as the medical board may require in order to properly complete its investigation in a particular case, shall be chargeable as cost to the losing party in the controversy, save that when the claimant is the losing party such fees, costs and expenses shall be borne by the commission.