1. Cardiology Department; University Hospital; Montevideo; Uruguay
2. Department of Cardiology; Sarawak General Hospital; Sarawak; Malaysia
3. Department of Radiology; Uniformed Services University; Bethesda; Maryland; USA
4. International Atomic Energy Agency; Vienna; Austria
5. Medical Physics Department; University Hospital; Udine; Italy
6. Medical Physics Department; San Carlos University Hospital and Medical School; Complutense University; Madrid; Spain