Hospital D has added a new process to its operations. The hospital has an excellent health and safety record, but its safety officer has just retired. Three weeks after the new process is implemented, employees began complaining of stiff joints, headaches, and tiredness. The timing of such complaints is coinciding with the active flu season. How does Hospital D differentiate between the two possible causes of the symptoms? Is the hospital obligated to pay medical costs associated with any testing? What questions should management ask, and how would management measure the results of its analysis?