1. Grupo de Bioingeniería y Telemedicina. E.T.S.I. Telecomunicación, Ciudad Universitaria, E‐28040 Madrid, Spain,
2. Resource for Molecular Cytogenetics, Lawrence Berkeley National Laboratory, Building 74, 1 Cyclotron Road, Berkeley, CA 94720, U.S.A.,
3. Nuclear Medicine Department, National Institutes of Health, Bldg 10, Room 1C401, Bethesda, MD 20892‐1180, U.S.A.