Oooh boy, Donna! Color me red-faced! I don't remember! It must have been just a synopsis of something I had recently read! I know, fat lotta help I am. I'm thinking tho that the Mayo Clinic website has that information. I'm sorry to learn of your hubby's situation - but - better safe than sorry! At least he has an option! (((hugs))) to you and yours and Happy New Year!
PB4 may well have that information from her readings or from her Canadian Crohn's & Colitis organization.
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.