1. University of North Carolina Chapel Hill NC USA
2. Nutricia Research Nutricia Advanced Medical Nutrition Utrecht The Netherlands
3. Nutricia Advanced Medical Nutrition Liverpool UK
4. Laboratory of Microbiology Wageningen University Wageningen The Netherlands
5. Visions Clinical Research Tucson AZ USA
6. Children's Hospital Los Angeles/University of Southern California Los Angeles CA USA
7. Meridian Clinical Research Omaha NE USA
8. Asheboro Research Associates Asheboro NC USA
9. Children's Investigational Research Program LLC (CHIRP) Bentonville AR USA