NEW TRENDS FOR NUCLEAR-MEDICINE - APPLICATION IN PUBLIC-HEALTH - AN EXAMPLE THE FOLLOW UP OF VACCINATION PROGRAM AGAINST HEPATITIS-B VIRUS (HBV) - MARIN, MD; LORENZ, P; MARIN, MC; SANTIAGO, R; FRANCO, P; CHAMORRO, JL; BERROCAL, JO (EUROPEAN JOURNAL OF NUCLEAR MEDICINE, 1984)