I have Crohn's disease and my greatest difficulty is the diagnosis and determine whether the disease is active or not, only if it is known is active when there is already pain, vomiting diarrhea, symptoms that may already be late and where only surgery solves . (as was my case).
I have no financial resources to acquire the heat engine, because I do not know what would be the most appropriate and rigorous model, but I believe the solution is here.