<qa>  What is the purpose of the therapy?12. Use of nutritional therapy parenteral nutrition or enteral nutrition with elemental or semi-elemental diets within 4 weeks prior to receiving the first dose of study drug. If the physician judges that nutritional supplementation is needed, enteral nutritional supplements will be allowed for patients who have been receiving a stable regimen for at least 4 weeks prior to receiving the first dose of study drug and that is intended to continue through the 8 week treatment period. 