1. Hospital Universitario A CoruñaA Coruña Spain
2. Institut für Präventive Medizin & Klinische ForschungMagdeburg Germany
3. Medical PlusUherske Hradiste Czech Republic
4. Health Research of OklahomaOklahoma City
5. Bluegrass Community ResearchLexington Kentucky
6. Novartis PharmaBasel Switzerland