docs: @Override
     protected void initialize() throws ServletException {
        /*
         * The servlet defines any number of resource providers, and
         * configures itself to use them by calling
         * setResourceProviders()
         */
        List<IResourceProvider> resourceProviders = new ArrayList<IResourceProvider>();
        resourceProviders.add(new RestfulPatientResourceProvider());
        resourceProviders.add(new RestfulObservationResourceProvider());
        setResourceProviders(resourceProviders);
     }