Du Mortier and Coninx stress in their document that MHUs should not be used to substitute Ministry of Health programming, but to supplement those services only in exceptional situations where access is restricted, as a last resort, if you will.  They identify very specific targets that MHUs can be used to accomplish. Substitution: As  described in the example above, where federal health programming is unable to reach citizens and IDPs, MHUs can be viewed as a temporary stopgap measure. 