I think the safest thing to do is to contact the Institute for High Altiude Medicine and ask them. I have contacted them many times about various issues and they are very helpful.

http://www.altitudemedicine.org/

Last edited by Cindy Abbott; 08/20/11 10:18 AM. Reason: spelling - as usual
Keep Dreaming
www.reachingbeyondtheclouds.com