Background
         Baseline health status,demographics,
Change in     medical intervention, lifestyle, education,
Health Status   =    f    comorbidities, other concomitant
(symptom &     medications, history of non-responsiveness
disease metrics)   to TX, host of other factors
         or
     D HS  =  f (HS0, MI, everything else)
Issue: How to measure D HS / D MI ?