[1] Natl. R D Inst. Microtechnologies, Str. Erou Iancu Nicolae Nr 32B, 72996 Bucharest, Romania
[2] NCSR DEMOKRITOS, Institute of Nuclear Physics, P.O. Box 60228, Aghia Paraskevi, Greece
[3] Mil. Ctr. for Cardiovasc. Diseases, Angiography Laboratory, Str. Mircea Vulcanescu Nr 88, 77118 Bucharest, Romania