A preliminary investigations judge on Friday handed bans from the medical profession to two doctors involved in the case of Domenico Caliendo, a two-year-old boy who died in February after having a damaged heart transplanted into him in December at the Monaldi hospital in Naples.     Heart surgeon Guido Oppido and his deputy Emma Bergonzoni, the doctors who performed the transplant, have been banned for 12 months and seven months respectively.     They are accused of falsification the boy's