The workers’ compensation commissioner may designate the medical director of the department of health and human services and two physicians selected by the dean of the university of Iowa college of medicine, from the staff of the college, who shall be qualified to diagnose and report on occupational diseases. For the purpose of investigating occupational diseases, the physicians shall have the use, without charge, of all necessary laboratory and other facilities of the university of Iowa college of medicine and of the university hospital at the state university of Iowa, and of the department of health and human services in performing the physicians’ duties.