1. University of California at Irvine, Irvine, California, USA.
2. Hospital Universitario La Paz, Madrid, Spain.
3. Vital Prospects Clinical Research Institute, Tulsa, Oklahoma, USA.
4. Barzilai Medical Centre, Ashkelon, Israel.
5. Clinical Research Center of Alabama, Birmingham, Alabama, USA.
6. Baker Allergy, Asthma and Dermatology Research Center, Portland, Oregon, USA.
7. Virginia Commonwealth University, Richmond, Virginia, USA.
8. University of Milan, Milan, Italy.
9. CSL Behring GmbH Standort Behringwerke Marburg, Marburg, Germany.
10. Medical Research of Arizona, Scottadale, Arizona, USA.