Huntley Pain Specialists, San Diego, California, United States
Comprehensive Pain & Rehabilitation, Daphne, Alabama, United States
University School of Medicine, Lublin, Poland
General Teaching Hospital Prague, Praha, Czech Republic
Institute for Clinical and Experimental Medicine (IKEM), Praha, Czech Republic
Istituto di Clinica Medica I° e Cardiologia A.O.C., Careggi, Italy
Azienda Ospedale S. Anna, San Fermo della Battaglia (CO), Italy
Duke University, Durham, North Carolina, United States
Long Island Jewish Medical Center, New Hyde Park, New York, United States
St. John's Hospital - Prairie Heart Institute, Springfield, Illinois, United States
Washington Hospital Center, Washington, District of Columbia, United States
Northwest Medical Center, Plantation, Florida, United States
Piedmont Hospital, Atlanta, Georgia, United States
MidWest Cardiology Research Foundation/Riverside Methodist Hospital, Columbus, Ohio, United States
St. Joseph's Hospital of Atlanta, Atlanta, Georgia, United States
San Raffaele del Monte Tabor, Milano, Italy
HELIOS Clinic, Siegburg, Germany