There is an amazing lady Allana Arnott, who should not even be alive, let alone walking.......Her book is worth buying,
The Best I can Be. I read it front to back one sitting, and I never read books like that!
Now she is ......read this, its very humbling. Yes not answering your question directly, but you will get the idea.
http://www.rotorlift.com.au/info/staff_aarnot.htm
J
