1. Bethesda North HospitalCincinnati, Ohio
2. University of CincinnatiCincinnati, Ohio
3. University and Polytechnic La Fe HospitalValencia, Spain
4. Hospital de Valme, IBISSevilla, Spain
5. Hospital Ramón y Cajal (IRYCIS. CIBERESP)Madrid, Spain
6. Koc University School of MedicineIstanbul, Turkeyand
7. University of Pittsburgh School of MedicinePittsburgh, Pennsylvania