1. Lancashire Cardiac Center; Blackpool Victoria Hospital; Blackpool United Kingdom
2. Division of Cardiovascular Medicine; Ain Shams University; Cairo Egypt
3. Division of Cardiovascular Medicine; University of Arkansas for Medical Sciences; Little Rock Arkansas
4. Division of Cardiovascular Medicine; University of Southern California; California
5. Division of Cardiovascular Medicine; University of California, San Diego Sulpizio Cardiovascular Center; La Jolla California